I've got a 4" scar on my side just above my waist. I used to occasionally get asked how I got it and I found that it was easier to lie and say it was from a tree limb in the woods, since the truth was, there was this sheep...
Yup, I was laying on top of a sheep and she kicked me...
OK, if anyone wants to believe me, I was trimming the hooves of a sheep and one of the hooves I had already trimmed turned out to have ended up in a pretty sharp point. While I was working on one of the other hooves she kicked at my side and gave me a pretty good slice. It hurt but I didn't realize how bad it was till I finished up the last foot and stood up to let her go. The guy I was working with looked at me and acted like he was about to pass out. It turned out that I already had blood soaking the side of my jeans all the way to my boots. The hoof was sharp enough that it cut quite deeply and left a pretty good scar.
I considered a knife fight explanation for the scar, but that would lead to further elaboration of a lie and I didn't want to do that, so I usually stuck with the tree limb story. Scar stories usually involved being disrobed with equally disrobed young women, and somehow, I just didn't want to bring my history with sheep into the conversation!