YO!
I am Bavarian. Born & raised on the bottle. It's an obligatory custom to dip a child's (mostly boys) nose/face into the foam crown of a freshly filled beer mug.
My personal thesis since over a decade and tasting most any major domestic beer brew: I drank enough beer! I fulfilled my quota already a long time ago.
Prosit!
http://www.youtube.com/watch?v=zDaXfLkL8ok&feature=related