If you have never seen a mockumentary, this is where to start.

Director Marty DiBergi (Rob Reiner) tries to capture the “sights, the sounds … the smells of a hard-working rock band”, Spinal Tap (Christopher Guest, Michael McKean and Harry Shearer). But this “legendary” British band turns out to not be quite so sort-after on their American comeback tour …

What follows is simply brilliant. When this film first came out many rock bands were convinced it was based on them. That’s how clever it is.

Once you’ve seen it, watch with the commentary which is Tap in character 25 years on. Priceless.