If I worked in an environment where I dealt with a lot of customers a day, I would definitely take cues from this guy and use some of these annoying techniques from
this list. Some of the highlights are:
6. Reply to everything someone says with "that's what you think."
7. Claim that you must always wear a bicycle helmet as part of your "astronaut training."
8. Follow a few paces behind someone, spraying everything they touch with a can of Lysol.
I didn't see the one where when asked a question, you answer with "Would you like fries with that?", but it works pretty good.
See the whole list
here.