hmmm, playing tricks on friends? Man vs Food type competitions? Mix into salsas?
A few years ago I bought Endorphi Rush (53k scoville units). Not knowing what I was doing I doused a steak in it as a marinade. I took one bite out of the steak and threw the rest in the trash. I ended up using tiny drops of it to flavor chili or soups (by putting a toothpick in and then stirring the toothpick into whatever I wanted to heat), but it was so incredibly hot that it usually overwhelmed whatever I put it in. Right now my go-to sauce is El Yucateco red, it goes great on burritos.