It happened near me at the top of block 36. Some bloke, 40/50ish was asked to stop being generally obnoxious early on by a steward. As the steward went back down the steps he followed and carried on the argument along the lines of 'stop picking on me, what about those kids over there with their feet on the ceiling' etc etc.
About 10 minutes later, about 4 stewards went up to him and the argument restarted, with him getting more and more angry before ripping off his Saints top and threatening the stewards with all sorts of violence. The last I saw was him being herded down in to the concourse.
Livened up a rather tedious first half - all seemed totally pointless as if he was looking for an argument and succeeded. Didn't seemed drunk or owt though - odd.