I would grab the banana out of their hand, then I would unpeel it, an smoosh it all over their glasses. Then I would throw the banana peel on the ground. As they stumbled around unable to see, being too silly to think to take the glasses off, they would slip on the banana peel, an land in a ruck on the ground. Whilst I giggle at them for being cliche, because they slipped on a banana peel.