You can wire bananas (and other things) to be capacitive switches/buttons, it was a nifty diy maker project a bit ago. It looks like he made a keyboard with them, so theyre bananas for scale (as in a musical scale)

Is there a joke in this pic? It might be just weird [al] for weird [al's] sake, but if there’s a joke please clue me in

Pretty standard, really.

That's Weird Al