That's it. That's the joke.
Funny, and sad. The Republicans will go nuts for a week or so about -- is he healthy enough to lead, don't we have an Amendment about that (do you Americans have an Amendment for everything? Why didn't you get your constitution right the first time?)
Joe Biden fell off a bike. I'm sure Donald Trump would say that he has fallen off bicycles way better than Joe, that he falls better than anyone, and that not even Humpty Dumpty could fall as well as a Trump.
The Insurrection meetings go on ... Humpty is falling and falling one by one ... that's the real joke.