- When someone yells 'boo!' as a joke and you faint
- When listening to Slayer calms you down and listening to black metal makes you happier
- You check you've turned off the coffee machine, hair straightener, locked the back door, and have your keys and wallet before you leave the house. At least twice. Then you double check that you've locked the front door. Then check it's closed properly. Half way to wherever you're going you freak out, wondering if you've locked the door, closed the door, turned off the coffee machine, etc. etc. - and you check that you've got your keys. Ten minutes later you freak out, wondering whether you checked the door, coffee machine, keys, hair straightener....