Lent somebody £80 back in..... fkn July maybe, maybe even earlier. Still owed £40.
and then you feel like a jerk to have to go ask for your money back and they act like if you've offended them or something.
It's even worse when it's less but from lots of people. If 20 people owe you 2 quid each, it adds up to quite a lot, but you look mean asking for it back..