I keep trying to tip at a restaurant and their blessed machine automatically inserts the .00 so I, for instance, will go to tip 2.00 but invariably it rings up 200. Lovely people and if I had all the money in the world, sure. But ... nah.
(for context, this is a serve yourself fast-food place and so the 2 dollars is reasonable as it's just one of those turn the tablet around sort of things)