David Jeffries guided lap around the Isle of Man on a GSXR1000. Absolutely nuts.
He died on the IOM a couple years back.
Here's a clip of the last 10 laps from the 2007 NW200, it's another Irish roadracing event going through tight towns just like the Isle of Man but it's not a time attack, the riders are right next to each other. Lots of passing and great racing, complete insanity.