Some of this borders on paranoia.

• aging
• the house burning down (especially when I'm not home)
• voyeurs, possible hidden cameras in restrooms and dressing rooms
• tumbling down the stairs on nighttime walks to and from the bathroom
• clowns
• the car door opening while I'm leaning against it from the inside (you'll catch me lock it sometimes)
• losing my harddrive again
• being a part of someone else's snapshot or video (tourist or amateur)
• drowning
• dying unexpectedly
• someone catching my mother leaving a key under the mat for the cleaning service
• finding the house burglarized
• bugs laying eggs in the house
• bedbugs
• insects buzzing near my ear
• being buried rather than cremated
• waking up to find that the dream of my teeth falling out of my mouth was actually reality
• someone cloning me from a strand of hair that's fallen on the ground
• losing my luggage
• doctors not giving optimal care to organ donors
• ant clusters, especially on food or dead animals