When I think of embarrassing moments this is the one that I think of although it didn't happen to anyone I know.
DRUNK HARLEY RIDER - happened when I was very young and stupid. My cousin and I were out on our Kawasaki Z1's bar hoping. But we weren't completely toasted. As we were coming up too a red light, we could see a Bandito ahead of us, we could tell he was a Bandito by his jacket. He was on a Harley and stopping as well. As he stopped, he forgot to put his foot down. Bam, down onto the pavement. As we pulled up, he had gotten off to pick up his bike. "You need a hand, man?" ... "No!" Okay, then. Later at the IHOP we stopped at, he pulls into a parking space, forgets to stop, drives through the surrounding shrubbery hits the side of the restaurant with a thud, falls into the bushes, gets off and leaves his bike just laying there. He comes in and gets himself a table and some coffee. We left before he did!
EL CENTRO CRASH - There's a flaw in the mapping on my KTM 990 Adventure. Every now and then the secondary butterflies slam shut for a split second, under certain conditions. Usually after running it to warm, stopping for a short while, then getting back on again. If your riding along, it has no real effect. But this time we had stopped in a town in Peru, but not really sure where. We wanted lunch, and there was a market. There was some celebration going on, all the stores and restaurants were closed. But there were hundreds, may be thousands of people in the central court, on the streets, everywhere. With everyone watching, because of our huge bikes and us being tall gringos, I cranked up the KTM to pull a U-Turn and head out to the next town. As everyone knows, if you lose power on a slow banked turn, you are going down. No if, ands, or buts. I planted that bike right there in the middle of the court, with hundreds of people watching. It was funny, no one came over although there were probably 15 people within 10 feet. It was like it was part of the entertainment package. My buddy got off his bike and I struggled to get out from under mine. Eventually we got back on the road again, but I was surprised by their reaction and somewhat embarrassed that I interrupted their festival.
If you ride long enough you will always have a bunch of embarrassing stories.