I'm always paranoid I'll be murdered in the two minutes I'm waiting, mentally going through that list of Ways To Use Keys As Lethal Weapons.

Dude! What a jinx!

I mean, I'm not paranoid. I'm cautious, meaning I still take stupid risks, and I don't think everyone getting off at my station is a mass murderer, but I also do the "Getting the keys ready in case of an attack" thing. When I'm really nervous, that's when I'm clenching my keys in my pocket, with the big spare car key sticking out between my middle fingers (just waiting for a sensitive temple or eye...).