Oh, lord. Our first show with my little fat pony mare as a 2 year old, we're lunging out in the open arena so that she can just.. chill, and she trots over a ground wasp nest. Cue pony taking off like a bat out of hell, with me on the end of the lunge line like a kite. I probably ate sand for a good 50 ft before common sense kicked in (over-riding the reflex to NOT LET GO), and I finally unhanded the end of the lunge line. I was the first to yell, "Loose horse!!" that day. Not the last though. No one could figure out exactly where the wasp nest was, other than somewhere in the north end of the arena.