I don't drive, I live in a city with excellent public transport, but on some (fairly rare) occasions I travel by taxi - usually booked in advance, so in ordinary cars rather than black taxicabs. It's always been my habit to get in the passenger seat if I'm on my own, and chat to the driver if they're so inclined. If I'm with someone else I'd normally get in the back with them. Today I ordered a taxi, and did my normal thing of smiling at the driver and getting in the front when it arrived. The driver looked very surprised, and said (in a pleased way, not a horrible way) that it's very unusual for people to do this, and when I got out she said she'd appreciated the chat as if it were an unusual thing. So HIBU all this time in thinking it's normal to get in the passenger seat if you're on your own - and are taxi drivers privately thinking I'm odd or presumptuous or something, and just not wanting to tell me? I sometimes think there are unwritten rules in life known to everyone except me...