One time when I was a kid, probably 10 years old or so, my mom was taking me to the airport to fly to my dad's place. She was driving, my sister in passenger, and I'm in the back.
'86 300td mercedes.
We were driving on the freeway with medium traffic, and we all heard and felt a big thump, as if we ran over something or hit a re-tread. We keep driving though as everything seemed to be okay, and I needed to get to the airport. After a few minutes, the water temp starts to rise and the car is going to overheat. My mom gets on the next off ramp so we can try to figure out whats going on. While we are sitting at the off ramp waiting for the signal to change, a highway patrol car pulls up next to us, and proceeds to look over our car and then give my mom some strange looks. He told us to pull over, which we were about to do anyway.
We found a big wooden stick/handle sticking straight out of the grille. Some idiot gardener/landscaper/handyman dropped a fucking axe off his truck (presumably) in the middle of the freeway. it must have bounced up off of the ground because the head of the axe entered the grille, penetrated the radiator and went straight into the engine block. If the axe had been a foot or so higher off of the ground it would have flown straight through the cabin for sure.
edit - also I ran over a fucking giant rolled up carpet in my fr-s going about 55 on the freeway