Ok, when everyone thought 'Paul is Dead' it was from one line buried in the mix that sounds like "we buried Paul", but according to Paul himself it actually said "cranberry sauce". Not sure about the 'smoke pot smoke pot' thing, but 'smoke on the water' can sound a lot like 'smoke marijuana'...but only if your -really- baked.
Unintended lyrics
Music to sooth the savage beast (breast).What songs do you know that people routinely misunderstand the lyrics, to the concernation or amusement of the artist. For example Dylans's "Excuse me while I turn and kiss the guy" (kiss the sky). Nylons "Give me the Beach Boys and free my soul" (Give me the beat boys and free my soul I want to get lost in the rock and roll)