A puzzling killer?

It’s like a thingymajig. A..a thingymabob…the, the whatchamacallit! One of those things..yk the thing you might use? And if you haven’t heard of it by that-it’s also one hell of a little gremlin.

The reason the doctor stays far, far away, But dropit in caramel, and it'll make your day. Once crashed a wedding and started a war, And fell on a smart guy to teach him gravitational lore

A bottle is my prison, three wishes my trade, but watch what you ask for, or your bargains may get played.

I glide across the surface, catching the eyes of those nearby. Who can resist my clean lines? So sleek, so swift, so pleasing to the eye. But when the forces all align, I dance with grace upon the brine.