I've had a client pay at the start but then go for extras mid booking. Rather than stop the fun I said we'd sort it out at the end and we both ended up forgetting. He got to the car before remembering, he said he came back but I must have been in the shower.
He's offered to double it when he comes to see me next, but since we both forgot I've told him there's no need and the original price agreed is good enough for me.
When I was a newbie had a client confess mid booking that he spent the money meant for me on coke and he'd happily split that with me instead... he was shown the door in short order and learned my lesson to get the cash up front.
On the other hand I've had a semi-regular decide to go from a 15min session to a 30min but wanted to go for a drive around the block in between (
) he paid for 30mins as it's cheaper than 2 x 15mins but ended up getting called into work and hasn't been back since. I've put a private note on AW saying I owe him so it'll work itself out lol.
xxx