I hate to be the bearer of bad news, but the writers of "Addams Family Values" beat you to this joke:
Amanda: Hi, I'm Amanda Buckman. Why are you dressed like that?
Wednesday: Like what?
Amanda: Like you're going to a funeral. Why are you dressed like somebody died?
Wednesday: Wait.
https://www.imdb.com/title/tt0106220/characters/nm0000207/