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Pop-Up Dice Tower
The fuel would all boil off before this lighter got anywhere near hot enough to produce copper fumes.
What I've read of scotchguard, the old formulation people swore by for waterproofing. The newer "environmentally friendly" formulation, people seem more likely to swear at for the application.
American Flag Concealed gun compartment that hangs on wall
When I think of pouring molten metal into water, I think of a steam explosion.
Granted, some Lithium Ion cells are capable of high discharge rate. But to assume that random salvaged cells can deliver such performance is risky.
Cast a Celtic Bronze Sword (Beautiful, Authentic Leaf-Shaped Ewart Park)--Easier and cheaper than you think!
A word of warning: the LiPo batteries sold for RC vehicle use are made for high discharge rates, as high as 60C (discharge full capacity in 1/60 hour) for high performance RC aircraft. Laptop batteries are designed for a much slower discharge rate, typically 1C. Drawing excess current from the battery can damage it.
Hopefully Brett & Heather will end up better than some of the couples on that list.
How to Make a Box
How to Build a Medieval Dining Room Set
Heatless (cold) Toner Transfer for PCB making
Wooden "Hobbit" Tankard
The Geiger Cable Dome
Minion Lawn Darts
Easy Bake Water Crackers
'Viking' beer mug (no power tools - the bushcraft way)
Ignition Coil High Voltage Display
Solid Wood Chess-board
Ultimate Instructable Costume Resource
Creating Helmets and Armor from Videogames for Fun and Profit!
Dual Fuel Metal Melting Furnace
Making Waterproof Fire Starters
Drink Can Tinwork
How to make a Dragon Skull
The Spiral Data Tato -- A Curiously Complex Origami CD Case
How to make a duct tape sword