What is the use of classical metaphors in literal situations called?
Such a play on words is called a pun or paronomasia (Greek: lit. "name change"). It may, as here, depend upon literalizing a metaphor or upon exploiting the near or exact homographs or homophones so frequent in English.
A pair of hunters, one from Prague, the other from Vienna, were attacked and devoured by hungry bears, a large male and his mate. A pathologist determined that the Czech was in the male.