This happens to lots of people, like when your about to ask a girl out or do oral presentation or the times you asked your parents for something expansive. We don’t notice it at first but then lightning strikes and we look at our sweaty palms. You could make a freakin drink with amount of sweat some people get. There is a more deep scientific reason to this than you might think. When our ancestors were in deep trouble they would start sweating from the hands/palms, generally when facing a stronger predator. They would use the moisture in their hands to climb the tree’s to take shelter from the enemy. That is why we have more sweat glands than any part in the body in the palms.