A "Scoville Unit" is the amount of spritzes from a spray bottle containing a sugar-water mixture it takes to neutralize a burn.... giving a jalapeno a score between 2k and 8k units. I don't remember the numbers, but back on the boat, during OC qual time, the reactions varied from mild to silly. While adminstering the spray, I remember that it took the typical person an average of an hour to be able to drive home. Before that, they were a sweaty, slobbering stinging mess. There was no trick out of the misery, but the best after-spray solution was Johnson's Baby Shampoo, applied liberally all over everywhere. I imagine that there are probably humans who are immune to these effects, but they are probably immune to bullets and lasers too. I can eat some really spicy food, but my eyes can't.