Eh, I don't think it is really meant to be funny, in the traditional sense. I think it's meant to be one of those "Ha! I understand it, therefore I am superior!" type jokes. The kind Mensa members like to tell each other. Humorless bastards.
Originally Posted by BlackDragonEX
But, how do you not know that there was someone already in the building; Going from 1 + the 2 that entered = 3 then - 3 would equal 0, then another 1 would make 1...
The joke didnt say the building was empty.
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