Spider-Man and Suicidal People

Alright, listen up, you big dummy! So, you got Spider-Man, right? He's always swinging around, hanging from webs between buildings. That's one kind of 'hang.' Now, 'suicidal people' is about folks who wanna end it all. And sadly, one way people do that is by 'hanging' themselves. See? It's a dark joke because it takes a word, 'hang,' and uses its two totally different, one innocent and one super grim, meanings to make a comparison. You actually made a pretty dark joke, even if you don't fully get it yourself!