NelsonsLongCatch
Cheesehead
It might not give them a long lasting effect with a one play. But I think it becomes a snowball effect, just like losing becomes contagious.
One great play can cause this team to come out great the next game and not get behind how they have the past few games, getting ahead, means they can run the ball more, which means it gives the Oline confidence, which can then start blocking better, giving arod more confidence in the blocking, and so on. Before you know it. It can become a team that "gets hot".
When Grantland was still a website, Barnwell wrote a great article about the myth of momentum. It's worth a read: http://grantland.com/features/bill-barnwell-theory-momentum-football/