Reminds me of that episode of Scrubs, where Dr Cox was going around with a tip jar, because if a guy pouring coffee gets a tip, he should get one from the people whose lives he saved.
“Why tip someone for a job I'm capable of doing myself? I can deliver food, I can drive a taxi, I can and do cut my own hair. I did, however, tip my urologist. Because I am unable to pulverize my own kidney stones.”
-Dwight Schrute, "The Office"