Where exactly do you draw the line on USB for attitudes, celebration, comments? I don't mean the "textbook" situations like taking the shirt off, using the corner flag etc. But on what the players say/do after scoring or other events on the field. Here's a situation I had this weekend, doing indoors, U16Rec, co-ed. One player, was clearly more skilled than others on the field and for the most part the game was close and he was fairly quiet trying to score. Slowly as his team pulled away, he started up. The fancy moves for no reason, like nobody near him, he would also dribble back towards his own net just to get someone to chase him so he could then take them 1-on-1 with a nice move. The other coach started telling his players to let him go, he's harmless back there, the player started then commenting things like "yup, I'm harmless leave me alone". Twice I told him to knock off the comments, once quietly as he walked by me, the other time I called him over and talked with him since he was getting louder and more mouthy. Finally after a goal by his team, he is rolling around in the center circle yelling out things about "another great goal" etc. I started walking over to him intending to card him for USB anyway, when the opposing coach said something about it being "unsportsman like and uncalled for" the player then got up onto his knees and looked at the coach and said something like "I'm just happy we scored a goal" a small amount of sarcasm tossed in. At this point I immediately pulled the yellow rather than finish my walk over to him. If he had even come close to a swear or offensive it would have been red, the act alone was probably worthy of the yellow, but I had had enough of his building up of attitude. Should I have pulled it sooner? He never really went over the line on any single act until that point, but it was slowly building as the lead got bigger. I figured it was going to happen sooner or later, just hoped he would get the hint from being talked to. Should I have pulled it sooner? the game didn't get out of control and I was watching for fouls growing from this behavior, which didn't happen. It was actually a clean game (both coaches had commented last time they played it got ugly), seemed like previous refs didn't call much for fouls, this one started out with a few bumps, which I called and it settled right down with no problems.