In It Takes Two, you fight the kind of common, red toolbox that might be sitting in your garage, or your parents' garage. It's one of the best boss battles I've ever played.
In the level leading up to this, co-op protagonists Cody and May learn to chuck nails and wield a hammer head, respectively. Cody can shoot nails into wooden surfaces; May can use the hammer to swing on those nails. Cody can nail moving platforms in place; May can hop onto those platforms, or wall jump between vertical surfaces that Cody can position via strategic nail shots. Eventually, he gets three nails to throw instead of one, leading to some excitingly frantic platforming.
The boss fight that closes this level uses those abilities in concert. Cody and May stand on a plywood platform, facing off against the toolbox. It can swing at them with bolted on plywood arms, which the duo needs to dodge. To deal any damage, Cody has to pin its long, wooden limb to a wall with his three nails, allowing May to swing over and smack its tinny body. As the fight proceeds, the toolbox shoots nails into the air which hurtle down at the plywood platform, a platform which gradually shrinks as the toolbox uses a handsaw to whittle it down to a nub with strategic cuts.
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