Why don't seagulls bark when they fly to Paris?

The reason why seagulls flying to Paris can't bark is because the seagulls in Paris are dumb (L 'Oré al Paris), which is a brain teaser and can also be used as a cold joke.

A cold joke, that is, a failed joke, means that the joke itself can't achieve the funny purpose because of boring, homophonic words, translation, or omitting the theme, different logic, judgment or special content, or because of the performer's tone or expression. But it doesn't mean that the joke itself is boring, which is also a manifestation of humor.