The one with Dany White against Atlanta ranks pretty high up there for me.
All of us remember the 1980 game but some forget White did it to the Falcons in 1978 too. Not with the drama that 1980 had, but Staubach got knocked out that day. We were huge favorites over Atlanta and didnt play well, had a bunch of fumbles as I recall.
Irony- Jackie Smith caught a 2yd TD pass in that game. You can see it in this video.
A couple weeks later, he had the worst drop of his career and one of the most infamous plays in Cowboy history.