Now comes word that Moscow Mules, which are made with vodka, ginger beer and lime juice and are traditionally served in a copper mug, could give you copper poisoning.
Apparently the problem is with the lime juice mixing with copper. Copper poisoning symptoms include stomach pain, diarrhea, vomiting and jaundice. Wonderful.
On a side note, if you like your Moscow Mule with a bit of a bite, try Cock N Bull. In my opinion, it is THE BEST ginger beer out there!