Every 24 hours, at noon, small rock appears in one of the shoes they are wearing.
They will grow a 5 inch translucent hair from the top of one ear every time they drink coffee.
15 minutes after they ride a bicycle they will have violent diarrhea with 5 minutes of warning signs.
Alcohol has no effect on them.
Every time they turn the steering wheel of their car further than 5°, their turn signal indicates the direction that the wheel turns.
They can hear what their dog or cat is thinking over any distance, but it is only a stream of consciousness because the animal is incapable of understanding that their thoughts are being heard.