I could spend all day reading wikipedia articles.

• Golden line
• Mark David Chapman
• Toilet paper orientation
• Dinosaur size comparison chart
• Mozart effect
• List of unusual articles
• Color of water
• Pheremone
• Filler
• Brfx...
• Placebo button
• Golden ratio
• Quantum mechanics
  • The related articles are interesting too.
• Eating utensil etiquette
• Fictional languages
• Wow! signal
• Star Wars day
• Russian roulette
• Severe weather
• Spontaneous human combustion
• Egyptian mathematics
• Optical phenomenon
• Burst of joy
• List of unsolved problems
• Skagit river hydroelectric project
• Satellite map images with missing or unclear data
• Rule of thumb
• List of eponymous laws
• Lateral thinking
• List of common misconceptions
• List of unsolved problems in philosophy
• Evil eye
• Fermat's last theorem
• List of unusual deaths
• Bristol Stool Chart
• Garden path sentence
• Untranslatability
• Spanish profanity
• Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo
• Agent orange