SENDing coins in the mail is dumb because they get stolen.
Certain Japanese coins have a hole in the middle, so I take my gold coins and put em on a stick like a shish kebab!
小 (small size) + 銭 (coin)
= 小銭 (coin)
銭 (coin) + 湯 (hot water)
= 銭湯 (public bath)