Believe it or not I actually tried something like this myself a couple of years ago after seeing the Drew Carey Show, Buzz Beer thing (and I bet Im not alone). I made a whole pile of coffe and added a couple of cups of sugar to it and some bottom fermenting yeast at the right temperature, left it for a few days and then tasted it. As you can imagine it tasted like !@#$%&*@#%$@!@!#.