Perhaps not as hyperbolic as they write but it’s definitely there. It might aid understanding to do an internet search for the phrase “don’t drop the soap”. I

Perhaps not as hyperbolic as they write but it’s definitely there. It might aid understanding to do an internet search for the phrase “don’t drop the soap”. I suspect what OP means is that people outside America don’t make similar jokes, not that it’s quintessential American comedy. It’s just (mostly?) uniquely American comedy.