But it is not a line that Spinal Tap needs to worry about. Spinal Tap is a razor sharp spoof/satire.
Spinal Tap is a great comic movie - hilarious from start to finish. It takes the (much copied but never bettered) form of a mock documentary (or rockumentary, if you will) following the spoof band as they go on tour of the USA to promote their new album.
Heavy Metal may seem to be beyond parody but Spinal Tap manages. The band is a glorious, grotesque caricature of a heavy metal band: misogynist & sexist, vain, split by internal dissent and artistic differences and hopelessly lacking is self-awareness.
The boys in the band all excellent and totally convincing and there are a lots of great cameos. The songs are glorious parodies of heavy metal songs; listen to the lyrics, they are often hilarious (and of course deeply offensive). The film is full of laugh out loud moments and memorable lines that have entered the lexicon (the airport metal detector, turn it up to 11).
To cap it all off the extras (listed in the product description above) are fantastic and hilarious.
Buy it, watch it, enjoy it