Ha ! I did that once... in my case we were camping out of the saddle.... the beasties were "suppose" to be all on the picket line !
I was up, moseying about on a 1 AM nature call , "a dark, moonless 1AM nature call " , I might ADD .... "China" my Mare had worked loose, but being loyaled herd bound stayed near by, but directly in my chosen path....
Rememering back, in my sorta sheepy stupor , I heard the munching, & tearing of grass, but did not see the 1300 pound Chestnut wall of
horse.... Bump ,
boom, OMG ! starteled horse , rear leg nailed me in the upper thigh... just east of the family jewels
needless to say, I was WIDE AWAKE ! smarting some but no real permanant damage....