judging by these comments, i think you would love the 2nd book in robert rankin's armageddon series, they came and ate us : armageddonII - the B-movie (sequel the armageddon - the musical !!).
this book has the distinction of having a sub-plot involving elvis presley joining forces with an intelligent, time-travelling brussels sprout - a role pretty much screaming for bruce campbell to play it in the movie, should anyone ever be stupid enough to try and make it...