Germany -- When toasting, stare your eyes off
But not because it's courteous. Don't even think about looking away as you raise your stein for a toast in the Fatherland -- break eye contact, and you can look forward to seven years of bad sex. Though it's hard to believe your Hofbrau could bring you anything but goodness, it's the absolute truth.
France -- You better hope you're still staring
Aside from putting your sex life on the line (yea, another bad seven years in the sack await you in France if you're not careful), the country boasts some downright weird drinking rules. Like, never fill a glass of alcohol over the halfway mark (a glass half empty, surely?), and sip on your drink slowly. You should also never drink before everyone else has been served, but that's just common courtesy.
China -- Toast so many times
As France slowly sips from its half-empty cups, China fills its glasses all the way to the top. They also love a good toast, often offering many during a meal or special occasion. (Just make sure you're holding your glass lower than anyone older than you -- it's polite.) Indeed, drinking is so sociable an activity in China that doing it alone is considered impolite..