Been riding since 1963, so I've had a few.
I used to pull up to stoplights and allow the front forks to compress, then release the brake so the bike would slowly roll backwards, then try to keep balance for as long as I could (like bicyclists do at lights without putting their foot down).
Did it once on my beloved 1969 H1 and managed to keep balance for quite a while, while cars were pulling up around me at a big intersection. As the bike started to tip to the right, I went to put my foot down, but it wouldn't go. The kick starter had found its way up my pant leg and down I went. I fully expected to see lot's of laughing faces in the cars around me, but instead shocked looks of great concern.
Another at a toll booth in the 70's when cars leaked oil and antifreeze readily - especially at toolbooths. Pulled up to a bridge tollbooth on a loaded heavy bike, stopped and put my left foot down into the slippery ice rink of oil and antifreeze, where it slid out and the bike and I ended up on the ground.
Two on my FZ.
Coming back from Las Vegas in March, pretty cold and loaded down with tankbag, saddlebags and dufflebag on top of that, stopped in Baker on I15 for gas, filled up and used the bathroom where it took me ten minutes to get enough clothing off to do it, redressed, got on my bike and headed out. Then thought maybe I'd forgotten my phone, so pulled over to check. The side of the road slanted off to the right, but I figured I could handle it. But I didn't take into account that the shoulder was lots of gravel on asphalt. Foot slipped and I couldn't handle the weight of the bike, all my stuff and full tank. Rolled off the bike, but still OK, but on the slope, the bike was past horizontal and a bit up-side-down. Which freaked me out because the last thing I wanted was for gasoline to leak out and start a fire.
So I made a valiant attempt to be Mr Universe and immediately pick the bike up (incorrectly).
Tweaked the crap out of my back unsuccessfully trying. Had to unload everything and then try again. I finally managed (can't remember if I did it the right way or not). I do remember I couldn't get traction for my feet because of the gravel. Bought some sort of pain meds and made it back to San Jose (didn't know if I would), but sore back for a couple of weeks.
Then coming up Redwood Retreat Rd. to it's intersection witn Summit Road there's a very big tree. I was going to stop to wait for my buddy who was behind and decided to skid to a stop in the dirt. Except the dirt turned out to be a dusty giant polished flat, wide root - like a tabletop upon later inspection. Both wheels locked up and down I went in an instant. Left side of the FZ this time, so I'm balanced.
I haven't had Chester's unfortunate experience and hope I don't. I've painted on my rear stand: "BIKE IN GEAR! KICKSTAND DOWN! HANDLEBARS STRAIGHT!" and I make a point of forcing myself actually to read it everytime I use it.
Definitely get some sort of case savers. I had them and I'm glad I did!