When out to eat at a restaurant, the person you are with asks the waitress if they charge for seltzer water. Most often a waitress will say yes, but sometimes the waitress doesn't know better and says no.
Customer: "Do you charge for seltzer water?"
Waitress: "Uhhh....ahh! I don't....no!"
Customer: "Great! I'll take thirty."
Manager: "You're such a seltzerstealer. Get the hell out of my restaurant!"