The first time it happened to me I was out working with them on a very hot late Spring day. Lots of compost, lots of thinning, lots of weeding and lots of beer . . . without a shirt. A sidearm would wrap around my neck while I wasn't paying attention and when I pulled away, slice. After many more slices and beers for the next few hours, I was ready for a shower. When the hot water hit my back . . . well, it wasn't fun. When I was done, I looked at my back in the mirror and it looked like I'd gotten 40 lashes! Those little climbing hooks are comparable to running a very sharp hacksaw blade over yourself. Limit the amount of beer and pay a little more attention - unless you like that kinda stuff. I guess some folks do you know!