Honestly, working in a coffee shop is one job I never wanted. People are such addicts that they think their drug withdrawal (because face it, caffeine is a stimulant drug and people are dependent on it) makes it acceptable to be nasty.

There should be a asshole tax, like that one place down in Virginia, CUPS Coffee & Tea.
"Small coffee"-$5
"Small coffee, please."-$3
"Hello, one small coffee, please."-$1.75