This is a classic Dad Joke, where one pretends to be astonished at the $7.13 one is paying for coffee and a sandwich (best used if there is another person at the table to appreciate the humor). See also Parents.
Something Dad would say when we were already crying. See also Parents.
Normal Dad just gives you a check in your birthday card....
Fun Dad has a $20 bill up his sleeve which "magically" slides into your hand when the handshake is over.
There is a fine, fine line between Fun Dad and Creepy Uncle. See also Parents.