If You'd Like to Know How Sound Carries, Consult the School Nurse

Biology teacher: [badly draws a woman singing into a microphone, which looks suspiciously like a woman about to give head] If you take this, for example...
[class laughs]
Biology teacher: [steps away from board and sees what class is laughing about] Uh...[erases drawing]... We're just not going to draw today.

Connecticut