From our, "There's a right way, and then there's other ways," file...
Tower: Cessna XXX cleared to land 20.
Cessna: Cleared to land 20.
Tower: Cessna XXX can you land and hold short 31-13.
Cessna: You bethca.
Tower: XXX is that a roger.
Cessna: ...Roger. Land and hold short 31-13.