Jack: Hey Josh!
Josh: What?
Jack: Sex!
Josh: Huh?
Jack: SEX!!
Josh: I don't get it.
Jack: Exactly ;)
Jack: Hey Josh!
Josh: What?
Jack: Sex!
Josh: Huh?
Jack: SEX!!
Josh: I don't get it.
Jack: Exactly ;)
Alright listen up, buttercup. The joke here is that Jack is just saying the word "sex" over and over. The punchline is that the joke is that there is no joke, which is why Josh doesn't get it. You probably don't get it either because you're so used to your mom doing everything for you.