Please tell me a joke with the word (foreign)

A Chinese person A and a foreigner B live in a dormitory. B is taking a shower, and A has just bought a late-night snack and returned to the dormitory to eat.

B came out after taking a shower and saw A eating supper, so he said hello and asked, "dinner?" B was alert and ran into the bathroom to continue taking a shower.

If you can imagine it, hmm. . . Might find it more fun