Tesla's Attic by Neal Shusterman and Eric Elfman
/The first thing Nick sees when he opens the attic door is a toaster, which immediately flies at him and gashes his head open. And that’s just the beginning of Nick’s weird experiences with the old junk stored up there. Determined to settle the score, he sells everything he can in a garage sale. It’s only later that he realizes that each item has extraordinary properties and that they were put in the attic by reclusive scientist, Nikola Tesla himself, as part of an elaborate scheme. Nick desperately tries to hunt down all of the things he sold, but there’s someone else looking for them too. The Accelerati!