When my grandpa was too old to harvest, but before anyone was willing to tell him that, his combine got hit by a train. Talk about f'ing stuff up. He got knocked out of the cab. On the plus side, he survived and got a helicopter ride out of it. On the downside, he was pretty much forced into retirement after that, which sucked. Because he loved that stuff.
Also, a farm dog owned by my other grandpa bit me right by the mouth when I was about three. You can see the scar, pretty easily if you know what you're looking for, but it's easy to miss. I'm pretty sure that dog got put in a burlap sack and drowned. Along with chasing cattle, biting the grandkids is a trait that is not looked upon favorably in farm dogs.