Despite what some people may say, I actually do want the zippers on my pants to stay up! I have this one pair of pants, though, where the zipper is just constantly coming down ... I don't have many pants to choose from, so when one of my zippers isn't quite functional that really limits my wardrobe.
The good news is that I've come up with a solution for all of the people out there with slippery zippers! Simply attach an old key ring to the pull tab thingy, zip up, loop the key ring around the button, and there ya go! No more slippery zippers!!
Yes, I know. I'm a genius.