It's a hobby :) Back when I was little, they used to have adverts on TV for the "Pepsi Challenge" (seeing whether random people in a shopping centre could taste the difference between Pepsi and Brand X in unlabelled glasses), and I always hoped that I'd get the chance to do that.

Regarding accessories, I always put ice in my Coke if I'm having it at home. More generally, I think all cola tastes significantly better if it's ice cold, either due to ice or because it's just out of a fridge.