[BoomerSooner]

The play I think you may be thinking of happened when Manning was under center. He settled in under center and then started doing his usual checks and moving around to "change" the play. As he was slid behind the guard and pointing like a maniac, the center snapped it to the running back (E. James), who ran for a first down. This play was flagged as the NFL has the requirement that once taking a position under center that player must take the snap. I'm not an NFL rules expert, but I think there may be an exception. Something like moving from under center and resetting in a shotgun formation might be disolve the requirment, but the general intent of the rule is to prevent deception.