I'm sure I'm hardly the only American who is accustomed to treating coins as basically a nuisance. I generally put them in my pocket, then later drop them in the origami box I keep them in at home, a pocket in one of my workbags, or the cupholder in my car. There they'll stay until they've piled up sufficiently that it's worth taking them to the bank to turn them into, you know, real money.
But here in the Eurozone, the smallest bill is a five, and I find my habit butting up against that reality. I can't just throw them in my bag and forget about them. All those 1- and 2-euro coins add up pretty quickly.