Money nobody wants
Believe me, money on the floor and no one wants to pick them up. I was in town and walking past a shallow drain, the type that is less 10cm deep, just a little below ground level. And there were 3 coins in it, 2 ten cents and 1 twenty cents. And the drain was dry and clean. Everyone just walked by without bothering to pick them up. Now I know why beggars are asking for $2!