Twice so far.
The first was aboutv 5 years ago in a parking lot. My wife and I will usually share a parking spot with one of us up front and to one side and the other back and to the other. I pulled into a spot and then she decided it was too narrow so she just kept going and picked another open spot a few spaces down. I decided to reposition the Road King to the middle of the space so lifted her up, raised the jiffy stand and moved it wher I wanted it. Then got off. I forgot to put the stand back down though. Doh! No damage other than my pride.
The second was right after I brought my CVO SG home. I was so tickled with the center stand that I was using it all the time, including in the garage. I was going to wash the bike so, standing beside it, I pushed it off the center stand to push it out to the driveway. Too much right arm or something and it got off balance away from me and I was in no position to hold her up. Over she slowly went against the metal garage door track. Ended up with a nice two inch deep scratch in the fairing. I said bad words. Lots of them.
I am sure it will happen again, just a matter of time.