It's certainly not the most practical thing, but this Scale Wooden Roller Coaster ($700) is rather amazing nonetheless. Built from 464 pieces of laser-cut birch, this functional 1:48 scale homage to early 20th century coasters features four hills, three turns, flashing LEDs that wrap around the red handrails, and a single rotating spring that drags the car back up the hill for the next run. [via]
Spend your weekend honing your intraoffice battle tactics with the Air Strike Catapult ($15). Arriving with its own set of six spiky foam balls, it can fling its projectiles up to 40 feet, or more than far enough to hit the annoying guy five cubicles down.