As a young rider, the old shoelace snagged on the gear lever trick caught me out, but only once. 2nd time was on the RHS side when I went to put my right foot down and couldn't because the kickstarter had snuck up my trowser leg - bloody flares! Funny thing was that it was at the same set of lights on the way to work. Lying on the road pissing myself laughing probably didn't help my chances of having someone help me up, but once I stopped laughing, I didn't have any trouble extricating myself from under my TX650A and getting it back up.
I can relate one instance where a member of the public did help me after an off, in front of a pub near the above set of lights at a railway crossing. Riding home from rugby practice, frost on the railway line, and a touch of front brake had me and my TX spinning down the road in front of the Railway Hotel, and patron did the right thing by me by pouring a schooner down my throat, before I could even get up. Rum would have probably been better first aid than beer, but who was I to complain. Times have changed somewhat!