I've been on both sides of the fence. Used to do trapping when I was younger, and some shooters used to let me have a go. I wasn't to bad, but then I had acces to Ian Paynes (Olympic medalist?) little black book of leads and numbers.
Was always funny to see someone shoot 8 out of ten clays, and then to fuck his score, just move them up the trap a bit to put them off course, and make them miss.
Or stick a bit of chewing gum on a rabbit clay to make it wobble, and bounce a bit more.
PULL!