The head of foam on a beer is important. Too much, and you're stuck with a mouth full of fluff. Too little, and you're wondering if the carbonation is correct. Buy a Professional Beer Foam Making Mug from Brando, and you may take control of your beer head destiny.
Press down on a little lever, and watch the beer go whoosh and foam up at the top. Brando refers to it as "joys for all people." The under-21 crowd could always use it to add some head to root beer, I suppose.
I'm not entirely sure how this $22.50 battery-free gadget works, but I can tell there's a trigger at the top of the handle connected to something underneath the mug, with a spring thrown in for good measure. A helpful schematic references parts like the "sparkling hammer" and "sparkling hole."
An appropriately nutty marketing video shows folks ranging from a business suit-wearing guy to some punk rockers clicking their beer mugs and exploding with delight at the results.