Chop chocolate into small pieces.Heat milk in a small heavy saucepan over medium high heat until it comes to a simmer.Whisk in sugar, vanilla and chocolate. Continue whisking until chocolate is melted and smooth. Remove from heat.Stir in red wine and divide among two small mugs or 4 to 6 shot glasses.Add a cinnamon stick to each serving if you like, and/or a tablespoon or two of whipped cream and enjoy!