One time i was in physics class.....
professor yapping, my eyes closed....and all i could do was think of all the sexcapades me and my girlfriend would partake in later that day.
oh man, i had a RAGING boner. It was redic. 
all of a sudden, i hear nothing. Absolute silence....
....i open my eyes, and what do i see?
the whole classroom staring at me, including my professor in total silence.
my pen0r went limp in .5 seconds flat.
so the moral of the story is: dont take physics 
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