Mace is mild compared to those things. I grow jalipino peppers which always come out extremely hot, just handling them and accidently wiping dust out of your eye will burn like mad. Great in a chili especially if you have a cold and are conjested. Loosens you right up.
That's exactly what happened to me. I touched the pepper, then touched my eye somehow, and that got my eye burning. Youch!
Did you know that if you grow jalepeno peppers near bell peppers, they will cross pollinate. Makes for some nice spicy bell peppers!!