$10 Bills

Whenever I get a $10 bill (And I'm not completely strapped), I put it somewhere other than my wallet, like a minor pocket of my coat, or a back pocket. That way, when I find it, it's like surprise money! I don't get that many $10 bills, so I'm not losing much out of my budget, and it's a nice little treat to reach in there and come out $10 richer. What do you think? Effective saving tip, or crazy weirdness?