An amusing question and one that I am in disagreement with most people on. First, 100 proof bourbon or anything else is already 50% water. Second, Master Distillers do not decide if their product is ready based on chilled glasses, ice cubes, shaking or anything else besides dipping the thief in and then tasting it. Third, anytime you aerate liquor you allow evaporation of alcohol much faster lowering the proof. Fourth, I've been to a few distilleries and have had the pleasure of trying blends both Bourbon and Scotch straight from the Tun in the case of Scotch, or a 1,000 gallon stainless steel tank in the case of one Bourbon distiller. They don't let the product "breathe" either since that changes the profile from what they want. Fifth, These is no correct way to drink anything. Some are just nastier than others but where that line is is up to you not me or anyone else.