I was once volunteering to help out with a large fundraising rummage sale... they filled up a bunch of ballons with helium, tied them to a broom pole, and sent me a half mile up the road to flag down passers-by on the highway. Naturally, I rode my bike to the corner.

After about an hour and a half or so, most of the ballons have leaked their helium, or popped, so I hop on the bike to go back and get more... unfortunately, I didn't pay attention to the now hanging strings and balloon.... Yeah... you guessed it, right into the front wheel, pulling the broomstick in after.

I sheared about half the spokes in the front wheel before crashing. I didn't get much more than a few bruises, as I managed to keep from going over the handlebars, ended up falling sideways. Had to limp the rest of the way, more carrying the bike than pushing it.