Originally supposed to be titled "Weird Habits Your Parents Have", I thought it to be more interesting if it didn't exclude siblings, friends, pets, teachers etc.
Re: weird stuff my parents do, my dad likes to drink milk/juice/soda until there's less than 1 serving left and just leave it till someone finishes and throws the container away. This afternoon he also left the carton out of the fridge.
My mom almost ALWAYS calls immediately after ending a phone call, returns home after leaving to check or grab something (not just the gas mind you), and busies herself without taking her seat at mealtimes even after the rest of us have started eating and asks her to join us.
How bout you TL?