Joke: A person takes a bus and puts sweet potato in the back pocket of trousers. When he went down, the sweet potato was suppressed. Everyone thinks it's shit contempt. Where is the original joke?

A buddy went to work in the morning and bought a baked sweet potato before breakfast. There were no seats on the bus, so I stuffed sweet potatoes into my fart pocket. After catching up with the empty seats, the buddy quickly stepped forward and sat in the seat. At this time, I heard a slight bang, and a big brown sweet potato was squeezed out from under my ass, still steaming slightly ... A car full of people boiled instantly. This guy tried to explain it clearly by action, so he grabbed it and put it in his mouth. Then an aunt next to her said, young man, there was a baby sitting in this seat just now. Her child pulled, and your sweet potato was on the ground. . .