What joke did Sebastian tell in The Black Deacon to amuse the funeral home?

Oh yeah ~ the landlord is really serious ~ bye ING

The handsome guy at the funeral is a character with great personality. His interest is listening to cold jokes. The so-called cold joke is a joke that most people can't find the punch line after telling it, or even can't understand it at all. Generally, crows and black lines will fly by in the picture of cold jokes. As for Mr. Deakin, all he did was a slightly exaggerated "stand-up"-talking to himself ...

So the landlord, don't tangle with the funeral handsome boy, human beings can't understand him, hehe ~