Could J.R. Smith be facing another fine from the NBA?

There was no word from the league Monday, but you can bet that NBA executives have watched replays of the stunt he pulled Sunday night in the Knicks' 92-80 win over the Mavericks in Dallas.

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Smith, who earlier this season was fined $25,000 for a Twitter battle with Detroit's Brandon Jennings, untied the left sneaker of Dallas' Shawn Marion just before Dirk Nowitzki shot a free throw in the second quarter. Smith, who was lined up next to Marion, reached down to straighten his shorts and then undid Marion's lace. Television cameras caught the incident.

It probably wasn't Smith's strangest play of the Knicks' three-game road trip. On Friday, with the score tied in the closing seconds of their 102-100 loss to Houston, Smith launched a three-pointer with 19.9 seconds left when the Knicks had an opportunity to run down the clock and take the last shot. He admitted afterward that he thought the Knicks were losing by two.

For the record, Marion didn't seem too upset with the prank. Right after Smith untied his lace, video showed Marion looking down at his sneaker. After playing defense on the next trip, he retied his shoe after the made basket and didn't look in Smith's direction.