You can't make this stuff up

Glad someone caught it on film, at least:

http://eightpins.blogspot.com/2009/11/adam-myerson-in-pits-at-new-gloucester.html 

As it turned out, the second flat was from a valve stem that wasn't completely closed and was leaning against something that accidentally depressed it. So while 2nd was still within reach when I flatted the first time, the combo of the loose cleat and and a good minute in the pit put me back in 6th for good.

Muddy days like this are just full of unpredictability, and even the winners are falling off  their bikes. Fast and steady wins the race, as Frankie McCormack always said.