The joke is from Quentin Tarantino’s “Once Upon a Time in Hollywood,” where Leonardo DiCaprio’s character, Rick Dalton, is trying to make a pun out of a serious conversation with Luke Perry’s character, Wayne Maunder. The joke falls flat, and the little girl, Trudi Fraser (played by Julia Butters), initially doesn’t find it funny until Dalton tries to explain his logic. Here is the conversation:

Dicaprio: Where did you get that limp?
Luke Perry playing Lancer’s son: In the war.
Dicaprio: Which side?
Luke Perry: I rode with the British Cavalry… in India.
Dicaprio: What did they call that outfit?
Luke Perry: The Bengal Lancers.
Dicaprio: (Starts laughing.) Nah, that’s funny.
Little girl: No, that’s not so funny.
Dicaprio: Don’t you get it? Bangel…Lancer?!
Little Girl: (smiling) Okay… now it’s kinda funny.

“I also saw a lot of videos of UFOs I mean what the f*ck has been going on with that shit. These n*ggers are here. These UFOs keep coming to Earth and it made me think of an idea for a movie It sounds dumb but hear me out. In my movie idea, we find out that these aliens are originally from Earth. That they’re from an ancient civilization that achieved Interstellar travel and left the Earth thousands of years ago to some other planet to go to when things go terrible for them on the other planet.
So they come back to Earth and decide that they want to claim the Earth for their very own. It’s a pretty good plotline huh? I call it Space Jews.”
The video: