Funny joke: Is there anything that becomes longer and thicker at the same time?

Funny joke picture: Is there anything that becomes longer and thicker at the same time?

In physics class, the physics teacher said, is there anything in the world that grows longer and thicker at the same time? Say that finish a female classmate sloped smile, and then the whole class boiling, the teacher blushed. At this time, the girl said weakly, "Isn't it just fried dough sticks?"