A post by another rider showing how he nearly got hit by a rock that came off a truck coming the other way reminded me of another peril.
Whilst riding in north Wales last year my friend and I were crawling behind a HGV going up a steep hill. Ready to find a safe spot to overtake. A sports bike rider seemed to think we were too far back and over took us both and pulled in to the rear corner of the truck in front of us just as the truck leaned on a corner.

Just as massive waves of animal pI$$ and **** came spewing out of the back corner covering him in it!!!
It absolutly stunk, but it was so bloody funny to watch I nearly fell off my bike laughing !!!! It was a trailer carrying animals.