I did some work on a farm when I was a young chap. My time there provided me with many stories but this one sticks out in my mind as one of the better ones.
We were checking cows to see which ones were pregnant, this involves putting cows into what is called a crush which keeps them in place while the vet shoves his gloved hand up there to see if there is a calf. Once he's done you open the gate and let the cows out, separating the ones that are pregnant from those that are. Most cows don't mind but occasionally one takes offense to Mr Vet shoving his arm up her clacker and on one of these particular occasions someone didn't close the end gate properly and so this cow took off with the vets hand still up there. Usually this wasn't a problem because the vet would be outside the crush, but for some reason he was inside (I think he couldn't get to the cow or something.) Next thing you know the vet is being pulled into the yard by the cow for a full ten feet before he landed with his nose in the mud.
If you can just picture a vet being dragged ten feet by a cow's vagina you can get the idea of just how hilarious it was at the time.