Cookie? comes free with foot-in-mouth.

Female Customer 1: "Oh wow... these cookies look good."
Female Customer 2: "Yeah."
Me: "They have soooo much fat in them"
Female Customer 1: "....."
Female Customer 2: "....."
Me: "Uhh... yeah. A girl who used to work here told me. It's like a slice of death!"
Female Customer 1: "....."
Female Customer 2: "....."
Me: "four dollars fifty, thanks.... heres your change......... see you 'round"

And by the way, customers never come into the shop as fast as they do when I've just sat myself down and started eating something. Regardless of how quiet it has been all day.