You Walk Into a Room and See Nine Were-rats Playing Poker...
This is a scene I can see so perfectly in my head.
My players walk into the back room of a seedy, underland (you know - the lands "under the earth" - where the drow and the duegar play) tavern. In the room they see nine were-rats playing poker with copper coins stacked in front of each player, and a pile of copper coins in the middle.
Without looking up from the game, the dealer says:
"If you want in for the next hand, the buy in is 20 gold worth of coppers."
At which point my players would probably attack, kill the were-rats rats and steal each rat's 2000 coppers.
Ah well, one can always hope they'll talk first AND then kill ;)