Yeah, I mean like a sofa, bumper, etc. I leave a larger-than-usual amount of space between me and the car in front of me, but in heavy traffic, you can't always evade, particularly if the car in front is a high-clearance truck, and the object clears that car, but not necessarily my normal-height sedan. Within hours of being back in SFBA I'd run over a boot, then another shoe (possibly the boot or another shoe), in separate directions of 101. It struck the front bumper and didn't seem to catch on anything underneath, but I was worried.

Roadside trash sucks, too, for different reasons.

(I call 911/CHP to report this stuff frequently, on average once a week or more. They send a CHP car or two out to road-break and remove it, or CHP+Caltrans if it's big.)