Gotta be The Kick IMO. Harrison finally showing what he's capable of after a rough season was may more unexpected to me than DJ making another clutch play for us. I don't think there will ever be another play that replicates the feeling that The Kick gave me. I went from rock bottom after uGA's score to the most insane level of euphoria I think I've ever had. That kind of emotional swing can't be healthy, but dang did it feel good.
Runner ups for me would be the 4th and 15 and DJ's forced fumble. The 4th and 15 play set the tone for the offense, and DJ's play set the tone for the defense. Both were turning points that helped the team start playing at a much higher level.