This is NO exaggeration.
With the exception of 1 or 2 games, EVERY airsoft game I've been to where the host didn't expressly state you had to have boots, I've seen someone either spain or roll an ankle.
"Someone in a Prius tried to race me at a stop sign the other day. I couldn't believe it. I had him for the first 100 feet or so but I can only walk so fast."