From Wikipedia: The Double Down contains "bacon, two different kinds of melted cheese, the Colonel’s 'secret' sauce... pinched in between two pieces of Original Recipe chicken fillets."
Think that's hardcore? Well this video begs to differ.
Epic Meal Time is definitely a sweet channel on youtube and if you like this video, go check 'em out sometime. I had difficulty choosing which video to actually post, because most of them are as equally great as this one.