My first one was the day my best friend picked up his first MC. We went to the church parking lot, he was worried about the low speed stuff. I was trying to reassure him, and thought I could show him how it was no big deal, even on a big bike. Tried to do a u turn inside two parking spots, not enough momentum and over I went.
The second was the first weekend the wife and I were out on the new to us RGU. Enjoying the curvy two lanes in southern Indiana, one of my boys tried calling so I went to pull over at the first safe place. Didn't pay attention to the slope of the parking lot, or the loose dirt and gravel, was more interested in the other bikers that were stopped. Went to put my foot down and at first there was nothing solid, then it hit and started to slide, the wife puts her leg down to try to stop it from going over and we went down in super slow motion. Luckily it was more of a set down than fall over so no damage to the bike, and we were both kind of straddling the bike so we didn't hit the ground.
My neighbor tells me all the time that you will do it with every bike you own, it's just a matter of time.