A professor goes along the corridor of the college. A student approaches him:
“Good morning, professor. May I ask you?” “Sure.” “Tell me, please, when you go
to bed where do you put your beard on or under the cover?” After some pause:
“Well, you know, I don’t remember…” “Well, sorry.” In a one week the exhausted
green professor with red eyes meets the same student and cries: “You, I can’t
sleep for the whole week! It is uncomfortable to sleep in both positions!