Nigel Tufnel explains his theories on Stonehenge for Nat Geo

To help promote last year's National Geographic special "Stonehenge Decoded," Nat Geo employed a strange partner in Nigel Tufnel. Tufnel was the fictional lead guitarist played by Christopher Guest in Spinal Tap.

Nigel's nonsensical explanations of things outside of his realm of understanding can leave a viewer in stitches. National Geographic recognized this and decided to create a series of Youtube videos that portray Tufnel being interviewed about his theories on Stonehenge. How does Mr. Tufnel explain the existence of Stonehenge? Well, "the original Stonehenge was made of wood...and by a process of rain, and peat, and saliva, it turns into rock."

Part 1, Part 2, Part 3, Part 4, Part 5

Nigel's association with Stonehenge Decoded, seemed to be a good pairing, seeing that the five theory videos combined have received over 160,000 views and the fact that Spinal Tap actually has a song called Stonehenge.

Another notable Nigel Tufnel moment: "Lick My Love Pump" in D minor, "the saddest of all keys"