Ummmm......I don't think they GAVE him the key chain. I imagine that key chain cost him a pretty penny......and a quarter or two. Obviously not the same cost wise, but when you purchase a Lambo you do get a commemorative and unique key chain. You just have to pay 250K for the privilege of owning a one of a kind key chain.
Oh, and for the record I have no idea if you actually get a key chain with a Lambo, but it sounded good.