Ok, so not an entire film but I found this site that made a spoof of knightmare called "Bad Dreem" it is one of the funniest films i have ever seen. Makes me wish There had been people like that on the original show!

anyway you can find it here -

http://www.fresh-love.co.uk/Movies/

made me remember knightmare and look it up, cannot believe there is a forum like this in existance!

GL