I must admit, I hate a bad line call. I don't think my opponents are intentionally cheating me - I just think sometimes they don't get a good look at the ball. When I get hooked, I let it go because it's unpleasant to argue, and one bad call won't usually lose me the match. But here's what really bugs me - the player who "thinks" my ball was out. When I call a ball out, I say "out" immediately because I'm sure it was out, 100%. If I hesitate even slightly to make the call, I give my opponent the point. What do you do when your opponent doesn't seem at all sure "in or out" - but takes the point anyway? Or worse, has a conversation with their partner, who didn't have a good angle to see the shot anyway? This happened to me yesterday.