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(I'm not actually disputing the parent comment, just for the record. It just reminded me of something.)

I carry at least a couple $2s around constantly, as well as dollar coins and half-dollars, for tips. Whenever I travel, I pick up a few dollars worth of non-US currencies at the exchange booth, so I can throw one or two in with a normal tip.

For a long while, I thought that getting tips in a strange currency format doesn't make any difference. After working a coffee bar for a few years, "it's the thought that counts" took on a lot more meaning for me.

Those really exist.

http://en.wikipedia.org/wiki/United_States_two-dollar_bill

True, but just try using them at a Taco Bell. Man, you should hear what happened...

Two dollar bills were also common currency in Canada in the 90s, until we replaced them with two-dollar coins.

I carry a $2 bill in my wallet most of the time.