The Skipping Bug is the Old Skool popper.
The standard fly among poppers for years, for both fresh and saltwater predator fishing. Toss this fly near a school of blitzing bluefish, rip it across the surface, and enjoy the surface fly fishing action. They'll be all over it. Make sure when chasing fish with teeth you tie up a bunch of these poppers with Haywire twists so you have them ready when the action gets fast and furious.