English joke: Mixed Doubles

Teacher of Physical Education: Have you ever seen mixed doubles

boys?

Nick: Yes

sir. Quite often. I saw it even last night. Teacher: Please tell us something about it.

Nick: Oh

sorry

sir. My father Always say

mixed doubles

P.E. Teacher: Have you ever seen mixed doubles, children?

nick: yes, sir, often. I saw it just last night.

teacher: please tell us about the situation at that time.

nick: oh, I'm sorry, sir. My father always said, wash your dirty linen in public.