For me it was when I was a Uni student, visiting family in France and went into a little French boutique that had reasonably priced trinkets - €10-€20. I picked up a purse simply because I needed a new one, assuming it was €20 as it was on a table with other €20 stuff. €135
I couldn't speak French very well and was too embarrassed to put it back so forked out. That was my food money for the month. I survived for the next 3 weeks on pot noodles and plain jacket potatoes 