It's a problem we've all had. In a busy pub, trying to maintain every drop of beer in your glass (so that it can then be placed directly into your mouth) is an almost impossible mission.
But, those geniuses at Hahn beer (creators of the world's greatest beer ad) have come upon a solution.
We don't want to spoil too much but you can see what they've created below. Maybe don't hold your breath about it becoming a fixture at your local though...