On occasion a zipper gets stuck in quite inconvenient situations. This may be when wearing a warm coat on entering an even warmer room, or most embarrasing while in a public restroom.
In both occasions I want the zipper to open or close as fast as possible but the more I pull the worse it appears to become. Also with trousers or coats visible control on what happened is limited if any.
Is there a way to safely and quickly resolve this?