The text plays on the cultural and religious connotations associated with a crucifix being a symbol to ward off vampires, and the expression 'Oy vey' which is Yiddish in origin, typically associated with Jewish culture. The humor arises from the juxtaposition of a vampire, which is traditionally repelled by Christian symbols like the crucifix, with a Jewish expression, suggesting the vampire would not be affected due to a different cultural background. This is not a traditional pun as it does not rely on multiple meanings of a single word or similar-sounding words, but rather on cultural references and expectations.
A Crucifix ? Oy vey , have YOU got the wrong vampire . . .