Alcohol. We all have a love of alcohol that surpasses even the Germans, Irish, Brits, and the underrated heavy-hitters of liver abuse, the Mexicans.
Seriously though, after looking through the matches on the DNA kits of both my uncle and I, we both match Czechs, Slovaks, Poles, Russians, Ukrainians, Serbs, and Slovenes. I figure there has to be some common ethnic origin way back there somewhere, unless the Czechs just went and fucked their way into every other country, which would explain my grandpa and myself pretty well. That guy was a master skirtchaser, and i seemed to inherit the gene, though diluted.