Remember firework snakes? Those little rocks that you light with a match and they smoke and puff out a coil of ash that ostensibly resembles a snake but actually looks more like a gross black worm? Surely we've put those in the game by now. Anyway this is like that, except when you light it, it extrudes an entire full-scale trestle bridge. Firework technology has really come a long way since the time at summer camp when we scraped the stuff off about sixty sparklers into an empty coffee can and dropped a lit match into it and nearly lost our eyebrows.