Magnets have always been able to suspend soft-drink cans in midair, haven't they? That's just basic science, right there.
The Magnetic Suspension Device - despite not having the most original name - can keep any bottle or can (up to 300g) dangling in its cylinder. And if I owned a bar that was trying just a little too hard, I'd be ordering them in bulk right now. [Chinavision via 7Gadgets]