Im a locksmith.
Customer: Do you make duplicates? Me: Yes C: How much? M: Depends on the type of key C: The normal one M: -_-
Or, after opening a customers door who was locked out:
C: Why so expensive tho? It only took you five minutes! M: -_- (Thats exactly why you dumb fuck, and I told you the price beforehand)
I also hate when people tries to haggle the price because I know for a fact that Im the cheapest locksmith in the area.