Scariest Motorcycle Moment:
I had a tire change on the Ducati back in 97 or 98, rode 200+ miles and was on an interstate doing 80 when the rear axle decided to work loose. Rear tire just-about-instantly locked up, cranked up against fender and swingarm, and bike did a whacky tail slide as I went from the far left lane, across three to the shoulder. I'm pretty sure the driver of the semi that I cut off lost sight of me and a wasp couldn't have flown between the back of my bike and the front of his truck.
I got the bike to the side of road, got off, walked about 10' away and then just sat there looking at the bike... smoking tire and all... for about 5 minutes.
Good Times!