The performer decides to take a snack break. He pulls out of his pocket a banana, unzips it, peels back the skin, take a bite and them meticulously zips back the skin and replaces the banana in his pocket.
This is repeated a number of times and gets funnier with each repeat.
This is a Giant size model of the Zipper Banana whose mere appearance will draw a laugh. This Zipper Banana comes with an imitation banana inside with a face. This provides for additional bits of laughter if used with a little bit of imagination. You could even use the banana for some ventriloquism.
The Banana is around 10″ long and can be seen by a fairly large audience.