Daves insanity sauce.
None of the newer kinds, just the original.
But BE WARNED it will hurt you if you over do it. I am not kidding.
That stuff is only mildly hot, I surprised the heck out of a friend, he had just ambushed a cohort with a dollop of the stuff on a soda cracker, and he was choking and wheezing...
Being able to eat hot peppers like M&M's I took a fair sized glob on my index finger and placed it in my mouth....
Yeah the stuff was hot, but I have had hotter, and there was no flavor, just heat. He just stood there staring at me in total disbelief, I didn't eve break out into a sweat, and my rule is the food is not hot enough until I do....