Who am I tipping, exactly? The kiosk? Myself? No one had even made eye contact with me up to this point. I have ordered fast food from a computer. When I have eaten it, I'm expected to bus my own table.
And yet, I felt bad for removing the tip before placing my order, and kind of slunk away from the kiosk hoping the kitchen in the back doesn't know whether or not I tipped, so they can't spit on my burger.