Do you remember that eighth grade science class demonstration where the teacher would have two bowls of water--one a bit uncomfortably hot and another numbingly cold?  And then the teacher would have students immerse one hand into each bowl at the exact same time.  The result was trippy--your mind would momentarily be confused as to which hand was hot and which was cold and it felt like each hand was feeling alternately cold and hot at the same time until finally your mind cuts in and says, "Okay, okay.  Left hand hot, right hand cold.  I got it."