But this is not truly funny comedy. These seem quite clearly made up and depend on this very specific scenario. I think truly funny jokes are ones that are plausible real life scenarios, that spot some sort of unexpected social circumstance or a phenomena with a clever take or perspective that people do not frequently consider and that many in the audience can relate with. Usually you would expect it to be something that actually happened or could have happened to the comedy teller, and you want to imagine them actually be in that situation. Or it can also be a common real life scenario, but an original, yet clever insightful take on it combined with the character of the teller.