What a great idea, esp since I don't chew gum! And, Baldrick, it happened to me even though I used my card, because the guy had accidentally hit the key for an extra riyal. I thought it was "the custom," since it was my very first time shopping in Qatar, and I didn't want to argue, but I will now. Or save the gum & use it as small change. What a hoot!

Britexpat, I like that idea - I'd much rather give to charity than have chewing gum.