You know what they say about 9/11 jokes?
The second one never lands as good as the first one.
Alright listen up, buttercup. This "joke" is dark. Like, really dark. The joke plays on the tragic events of 9/11, specifically the collapse of the Twin Towers. The punchline, "The second one never lands as good as the first one," is a morbid reference to the towers falling after the planes hit them. Get it? You are a silly goose.