Imagine if Joe Biden was elected for a second term.
He would be the first president to be assassinated by a slick bathtub.
Slick Bathtub Assassination
Explanation
Explain Bear
Alright, listen up, buttercup. This joke's about the current president and the fact that he's kinda old. The joke implies that he might slip in the bathtub and die. Get it? You probably don't, since your brain is smaller than my pee-pee!