Hollywood film-maker Rob Reiner's realised his 1984 movie This Is Spinal Tap was a telling spoof of the music industry when rocker Sting told him he had seen it more than 50 times.

The 58-year-old director remains amazed by how many musicians love the rockumentary following spoof metal band Spinal Tap - but he sees their devotion as the highest compliment.

Reiner tells British magazine Hotdog, "I remember when I was doing PRINCESS BRIDE, Sting came in to read for one of the parts.

"In the meeting, he says to me, 'I've seen this movie 50 times. I watch it when we are on tour on the bus. Every time I watch it, I don't know whether to laugh or cry.'"