Involuntary Muscular Contractions 무의식적인 근육 수축   

A professor at the University of Wisconsin was giving a lecture on the Involuntary Muscular Contractions to his first year medical students. 

Realizing this was not the most riveting subject, theprofessor decided to lighten the mood slightly. 

 He pointed to a young woman in the front row and asked,    

- Do you know what your ass hole is doing while you're having an orgasm?

 She replied,

- Probably playing golf!

 It took 45 minutes to restore order in the classroom