What kind of joke will sweet potato photos become?

This is a cold joke. Taking pictures is homophonic than saying "yeah, yeah" and "yeah". Shooting sweet potatoes will turn into sweet potato leaves (yeah). A cold joke means that the joke itself is boring, homophonic, translated, or omitting the theme, different logic, judgment or special content, or because of the tone or expression of the performer, it is difficult for a joke to make people laugh, so it becomes silent, but it does not mean that the joke itself is boring, which is also a manifestation of humor.