I've had a generous share of odd and scary s***, on the road while driving cars, trucks, buses and mcs.
Crossing the Throgs neck bridge from Brooklyn to Staten Is., NY a box spring suddenly blinded me. Heavy traffic left no choices. It did a vertical shot, coming out the back end, of the car. Didn't even get a flat. When I next serviced the car there was rather heavy spring steel wire wound around the drive shaft.
I've carried many turtles; most of them snappers. Some big enough to be dangerous when lifted and carried. Claws are nasty, but that violently swing neck and head are more so.
Don't ride behind p/up trucks! A 4x4" square of 1/2 or 3/4" ply came at me like a frizzbee. It felt as though I would loose my knee.
Potentially much worse: K11RS. While following the car in front of me (left lane, 4 lane expressway), the car moved to the right and exposed a P/up that had a wooden picnic table w/benches tipped upside down over the roof of. It was floating on its end in the wind blast. There was no place to go at 70+. It hit the flasher button and the brakes. The table and benches, still together had flipped over the tail gate and dropped onto the highway. Fortunately it kept sliding as I was slowing, allowing more room to stop. I went over the smashed table top at ~30m/h, ABS clacking away and my heart in my throat. Or was it my stomach. Of course the P/up never stopped. And no flats! R3~