Yes, I have.

Was on a big heavy beach cruiser. My wife was already ahead. I came across a skate board ramp kids had set up. I yell to the wife: "hey watch this". Got up a good head of speed and took the ramp. Midway thru I knew it wasn't going to work and tried to bail off the bike but got caught up and landed hard on the chin. Bad cuts and road rash to arms. Lesson learned: beach cruisers are not mountain/BMX bikes.