*mind goes blank* Hmm, a machine that you could trap onto your back which gives you wings and you can fly with it. Yay! Flying! It will also give you the power to go into space without wearing a helmet because it would genrate a forcefield that would stop you from getting crushed! Also includes a variety of flashing lights and multicoloured buttons, windscreen wipers, not fully refundable. Warning: may be irritant, corrosive, toxic and flammable if exposed to stupidity.

...Damn i'm not allowed my own invention