What are the classic jokes in photography?

I am a photographer. One winter afternoon, I went out to collect the wind and saw a beggar shivering in the cold wind with a bowl. His clothes are in rags. I felt sorry for him, so I gave him some money to take a picture of him. After pressing the shutter, he said, Remember to turn up the aperture next time. I was surprised, but I said disdainfully, "You don't know the parameters I used. How can you let me turn up the aperture? " He said vaguely, "At the moment when the shutter opened, I have judged it according to the number of blades and the aperture size ..."