A couple of weeks ago whilst coaching I was using my sidearm against the best batsman in my u15s, probably the best bat in the colts, who is a Bucks opener and bats above me in the 1sts and 2nds at the moment. Out on the square on a flat and fairly slow track, went for a cross seamed ball to make it jump and test him. Unfortunately it did jump, and also cut in sharply past the inside edge, and apparently caused him significant discomfort. I think it toughened him up though, he's got four half centuries since, including his first for the county and 96 from 58 playing for the club u17s.
Week before that I was keeping in an 8 a side tournament, and was standing up to a medium pacer. Had taken a couple cleanly, and then one managed to nip under my gloves and cracked me on the box. Was a bit breathless for a while, was glad I'd remembered my box!