I used to play in some pretty big money matches back in college from time to time, and I'd mostly play with the same guys. We all knew each other and knew we were honest so there were no problems. There was this one guy who I'll call Cary (because that was his name) who we knew and had a reputation as a cheater, sort of something we'd heard, we hadn't ever played with him. He was one of those guys if you ran into him at the bar that night and he'd say "hey Doug, saw you on the course today, how'd you shoot" no matter what I shot, he'd say he shot 2-3 shots lower than me. Maybe he was just better than me, but anyone who ALWAYS beats me is going to shooting some mid to upper 60s on his really good days, and not just beating my 75s with a 72 and 83s with an 81 every damn time!
So anyway, one time one of our guys doesn't show and Cary happens to be there so we play with him. We're playing our money game and he wants in and we're doing everything we can to discourage it but none of us have the guts to just say upfront that we don't trust you, so we let him play. He hits into some bad places here and there, and on the 6th hole he hit a shot somewhere I knew would be really hard to find, but somehow he came up with it almost immediately. Since we're all walking, he's over there alone so we can't really see what's going on (maybe that's one thing in favor of carts)
So at the turn, one of my buddies is sure he didn't really find his ball back on the 6th, and he wants us to watch him really good. On the 12th hole Cary duck hooks it into a pine tree and it ricochets into some deep grass. The rest of us successfully cut the dogleg without the duck hook so his ball is on our way so we all help him look for it.
We hunt around for a couple minutes and find a couple balls, but not his. Cary kind of walks away from us a bit, and then announces he's found his ball. My buddy Jim is asking him, "are you SURE that's your ball?", and Cary says he's sure, that its got his mark on it, and he's pointing at it like he wants us to inspect it and see he's telling the truth. So then Jim pulls a ball out of his pocket, and says he found it a minute ago and its not only got Cary's mark on it, its also got a bit of a scrape and some tree sap on it from the tree he hit, and asks to see the ball Cary found and says he bets it is shiny and unblemished! Cary's looking like a deer caught in the headlights and Jim just goes ballistic on him and basically tells him if he doesn't get the hell out of there he's not going to be able to swing a club for the rest of the summer.
Now the funny thing is that Jim had just found some random ball in the weeds and just TOLD Cary it was his ball because he was so sure Cary was cheating and wasn't smart enough to keep balls sticky with pine sap handy in his pocket