What would you buy if you had $250,000 to blow on whatever you want? A house and a loaded German sedan->ke142? Or maybe skip on the house and place an order for the new McLaren 570S? Granted, there's a lot of stuff you can buy with that amount, but you probably won't spend it on a car key fob made of platinum, onyx, and a whole lot of diamonds. Unless it has a Koenigsegg->ke43 emblem and comes with the Agera R, that is. And $250K doesn't sound that expensive when it grants access to a $2.8-million supercar->ke177, right?

So what's the deal with this key fob, which is probably the most expensive ever made? For starters, it's circled with 40 carats of sparkly diamonds, and the rest of the fob is made of platinum and black onyx, both very expensive materials. Made by Optimal Innovative Solutions, the same company that makes diamond hood ornaments for Rolls-Royce->ke74, it's actually just a custom, one-off piece and not a production item. It's not yet available as on option with the Agera->ke3628, but I wouldn't be surprised to see it on the customizing list of other Koenigsegg supercars if there's enough demand. For now, it's just as impressive as the Agera R price-wise.

Not that I will be able to afford a Koenigsegg anytime soon, but I'd rather have mine with a carbon-fiber key fob. How about you?

Koenigsegg Agera R

Read our full review here.