Self Stirring Mug. It’s brilliant! No, we don’t know why, but watching it swizz your morning brew into a hot swirling vortex at the touch of a button is guaranteed to cheer you up. Better yet, make an instant soup and watch in glee as your dehydrated croutons run laps around the rim. Ah, it’s the little things in life... So how does it work? Well, a tiny battery-powered impeller at the bottom of the cup spins rapidly to swirl the liquid around the bottom of the cup.