A and B go on a trip together, A drives and B pays half for petrol. B also buys snacks/ drinks on the drive and doesn’t ask for money back as wants to thank A. A has a minor accident on way back and part of the car is slightly damaged, B offers to pay half in the heat of the moment and A has now asked for half. It isn’t expensive but also it isn’t B’s fault... (The cost of snacks and drinks and supplies B has bought for A probably add up to cost of B’s half of car part). Is anyone BU or not?