thieved [and slightly edited for clarity] from the facebook group!

• High school cafeterias are vast and spacious, leaving plenty of room to spontaneously break into song and dance, and are in no way packed, crowded or uncomfortable.
• It's completely acceptable for the female drama teacher to walk into the male changing room where her young male students are showering.
• A white, 5'9" junior is the best high school basketball player in the state of New Mexico.
• In school hallways they put up really big posters of the most popular boy in school so that obsessed girls can sing to it
• It's okay to practice incest if you're acting.
• Students are allowed to work with chemicals unsupervised.
• Everyone has a secret, and they have practiced to tell everyone about it...in perfect harmony...while dancing...through the medium of song...
• In high school, you only have class once a day and it's only about 10 minutes long. For the rest of the day you can sing, dance, play basketball, make/foil plans, and hide out in secret gardens as much as you want.
• Teenaged couples only sing when they're alone together. Nothing more, nothing less.
• Parents do not teach their children that it's okay to be yourself, only pop songs can do that.
• Singing and dancing in the hallways is outstandingly normal.
• If you're the new kid in school, no one is allowed to look at you
• If you audition for a school play, you send the entire school into pandemonium.
• Some high schools only have 5 adults on campus. That's how the students get away with dancing in the halls.
• When you're in love with a stranger, you can memorise lyrics at the drop of a hat.
• If you're a stressed jock, you need only to go to the school gardens and sing... nobody will find you or pick on you.
• If you love a girl enough, breaking and entering into her room is not considered a problem.
• You have to take the bus to school even if your father works there.
• Warning bells can be easily mistaken for cell phones.
• Only fat girls like to pop, lock and drop it.
• All stage fright can be cured by the saying “like kindergarten”
• You WILL stick to the status quo and if you do not then the entire student body of your school will sing to you until you agree to do so.
• Students in high school don't need backpacks... or books for that matter.
• No one will find it weird that you're singing a sexual song to your sibling.
• If a girl hates you then the way to win her love is to climb up her balcony while she remains oblivious in her bedroom.
• People keep outfits in their lockers in case of any nacho-related incidents in the cafeteria.
• All fathers with sons in sports are oblivious to their sons's other needs and desires.
• Teachers from different departments always hate each other.
• If you make good cookies, people fall in love with you.
• A high school can produce 17 musicals in a span of two years.
• Singing absolves a person of any bad thing they've done.
• An entire school's network can be crippled by the push of a button.
• Chilli cheese fries and milk are a substantial meal.
• The very best way to condemn your friend for singing is to break out into a song yourself.

And from the sequel :)

• If you wish to show your inability or dislike for dancing, it's perfectly reasonable to break out in a dance number...
• If your love is strong enough, fireworks will go off, and lanterns will fly away as you and your boyfriend kiss.
• Your friends are not real people and should always be addressed by the name of their school mascot.
• You can be a chef, lifeguard, or golf assistant...no experience needed!
• A guy can never wear too much bronzer.
• The phrase "more moves than an octopus in a wrestling match" is something that can be used in everyday conversation
• There are two bells that get you out of school. The first one tells you to start singing and dancing, the second announces you should stop.
• Even though its the last day of school, its ok to leave stuff in the locker for the summer.
• Pianos can float now.
• If you're upset, just run through a golf course, jumping and spinning, while singing "Bet on it"...you won't fall at any point, and no one will stop and think "what the hell?" .
• You can send telepathic messages to your mom to tell her to pick you up just as you're finishing your breakup song with your boyfriend.
• A resort can be highly successful when there are more employees than guests.
• It is now possible to hire an entire high school to be the staff at an upscale country club.
• Being a teenage paparazzi at school and taking multiple pictures of the same two people is not weird or creepy in any way
• It is okay to try to grope your girlfriend if she's leaving you, even though you have never kissed before.
• When you frolic with your girlfriend in the golf course, you get in trouble. When you frolic by yourself and sing, nothing happens.
• It IS possible to have any object in the world come in pink & engraved with your initials.
• If you are the basketball star of your school, you can get yourself, as well as the rest of the school, summer jobs.
• Tiffany’s makes hair bands
• When your girlfriend breaks up with you and gives your necklace back, she obviously will somehow emerge out of a crowd wearing it again and singing.
• Clocks get bigger if you stare at them and chant "summer"
• You can be a male theater geek who wears sparkly hats and pink shirts, without any of the jocks who you kind of hang out with questioning your sexuality.
• It is now acceptable to throw grapes at your girlfriends face.
• It is not at all pompous to give your girlfriend a necklace with your initial on it.
• The high school marching band is on call 24/7 for spontaneous musical numbers.
• When you're frustrated with your personal life at work, just take off your shirt and shoot some baskets. Your boss won't mind.
• Not telling your girlfriend about your new dress shoes you got from your boss, clearly is a reason for her to be concerned and question your relationship.
• On the last day of school, it is perfectly normal to chant "summer" like a cult.
• It is worth risking your relationship with your friends and girlfriend for a college that closed down in 1986.

God bless High School Musical! Learned far more from these films than I ever did during the six years I was at high school!