Flacco threw red-zone touchdown passes in the first half -- the first to Anquan Boldin and another to Dennis Pitta.

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If he wants to hobble into the end zone after a touchdown like a Pop Warner coach Mr. Ryan later explained the limp by saying he'd taken a "header" days before it's tough to argue the bottom line.

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The NFL has tested them in their end zone pylons to capture touchdown replays.

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In what became a widely mocked symbol of the quality of officiating by the replacements, a photo from that game shows two officials in the end zone displaying competing signals: one indicating a touchdown, the other an interception.

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In the final seconds of a nationally televised game between the Seattle Seahawks and Green Bay Packers, replacement referees first disagreed about a catch in the end zone, then mistakenly awarded a game-winning touchdown to the Seahawks.

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Ware for 12 and then tossed Hakeem Nicks his second touchdown of the day, into the right corner of the end zone.

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Back on the field, fans can make prop bets on the first touchdown celebration--will the first player who rumbles into the end zone mug for the cameras with a spike, a backward flip of the ball or a he-man muscle flex?

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Now active as the Browns take on the Ravens in a game where a defender catching the ball in the end zone with both hands is likely to be ruled an interception and not a touchdown, Thursday Night Football Xtra promises fans additional interaction with polls, games, stats.

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Jennings had simultaneously caught the ball in the end zone, which, under NFL rules, resulted in a completed pass and a touchdown that gave Seattle a 14-12 win.

WSJ: NFL Blindsided by Ref Furor