[Temporary_User]

39. Never tip with coins that have touched you. If your change is $1.50, you can tell the barmaid to keep the change, but once she has handed it to you, you cannot give it back. To a bartender or cocktail waitress, small change has no value.

I don't understand this one. I mean I often buy my drink, say $6 with a twenty. Typically I get two $5's, a twoonie and two loonies back. I doubt I'm supposed to ask the bartender to keep a loonie or twoonie before handing me back the rest of the change. This is nearly impossible in a loud bar. What I typically do is take it all back, and select the tip out from that. This rule suggests that this is wrong. What should I do?