Its a brain dead duct....it leads to a tube that is put on the back of the head of the idiot driving (who installed this) so that he can still function when his 1 brain cell heats up too much. 
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Not to be able to stop thinking is a dreadful affliction, but we don't realize this because almost everybody is suffering from it, so it is considered normal.
Last edited by SINISTER; 04-14-2017 at 08:31 PM.
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