It happened near the start on our 6 hour training ride. Before we'd even reached the singletrack. I'm not sure if it was the colors on my new Moots racing kit or the tiger stripes on my Ellsworth Evolve 29er, but it almost shut me down. For several minutes (before the video was taken) I tried to solve the problem to no avail. Blow as I might, the little sucker stayed put, squirming and crawling around. All in all it was a pretty unique problem and quite disconcerting.