One of the hottest I've had was Daves Insanity Sauce, 1 drop was all You needed I believe at the time it was the 3rd hottest sauce out there. You can ask My Bro in law, Dumbass! Took His pinky finger in the tip of the bottle and licked it off His finger. After 30 second's His Lip's and Tongue swelled up, thought I was going to rush Him to the hospital.
My Favorite is Chile Habanero, Green Hot Sauce by Elyucateco, I can take up to 1-2 teaspoon's and find it enjoyable. If You have some good one's or good or bad experience's let's hear about them.