Bananas are funny. They just are.
They're phallic. They're slippery. They're yellow. You know...Funny!
That's where this idea began. That and they are essential to a good smoothie.
They also bruise easily resulting in a luscious brown mark. If you dig your fingernail into the peel you can control this mark a bit more. Using an X-acto is even better (see below)
OK so that's that banana component.
It's also funny when people fall down.