COLLEGE STATION, Texas » Heisman Trophy winner Johnny Manziel served his suspension for No. 7 Texas A&M in the first half today against Rice.

In the second half he hit the ground running — and apparently running his mouth, too — as he threw three touchdown passes and scrambled for 19 yards and the Aggies wrapped up a lopsided 52-31 win over the Owls.

He was suspended until halftime for what the school said was an "inadvertent" violation of NCAA rules involving signing autographs.

His first touchdown of the season came on a 23-yard pass to Mike Evans on A&M’s next drive. Manziel scrambled for eight yards on third-and-7 on the play before the score and appeared to mimic a signing motion while talking to a Rice defender after getting up from the tackle.

He drew an unsportsmanlike conduct penalty after a touchdown throw in the fourth quarter when he was jawing with the defense again and then pointed at the scoreboard. He was replaced by Matt Joeckel on A&M’s last drive.

Joeckel started at quarterback for A&M and threw for 190 yards and a touchdown to help the Aggies lead 28-21 at halftime. Manziel came in on Texas A&M’s first offensive play of the second half and the Aggies capped his first drive with a 44-yard field goal.

Manziel was being investigated for allegedly accepting money for autographs from memorabilia brokers, a violation of NCAA rules that could have led to a much longer suspension.