You're out of credit on your mobile/cell phone, you ask a friend if you can make a call, how long do you chat for?
Probably around 30 seconds, most definitely below a minute, that's what most of my calls last anyway, so I don't see why it would be different on someone else's phone, though I normally get around without using phones.
And yes I do mean I keep most of my calls short, I remember when my grondmother died earlier this year and I had to call my brother to tell him and the call was literally "Uh, sorry to bother you but I am afraid grandma has died, come to our parents house as quickly as you can we'll be waiting." and then I hanged up, I just really hate using phones.
When passing somebody in a cinema/airplane (etc) do you give the person the crotch or the ass?
Wait, what?! Eh, I've never given it much thought actually, I can't remember probably have done both.
You get on the bus and there is 1 seat left and you're by yourself, do you take the seat or leave it? Maybe go 1 cheek or try to leave as much space between you and the stranger?
Eh, normally I stand, I don't mind sitting next to strangers too much but normally the buses are packed or get full a few stops later and I prefer not to take seats from anybody, if I was seating and somebody gets in I normally give them my seat too, that's just how I am I guess.
If you are in a taxi... do you talk to the driver? What do you say?
Eh, I'm not very talkative, I'll answer every question they give me as briefly and non descriptively as possible, I haven't really bumped into a taxi driver that doesn't get the message that I don't want to talk to them, doesn't really help that I always look and sound dead serious and have a scar over my left eye, normally people don't mess with you if you look like that.