Maybe this has been talked about elsewhere, but I had a thought today while discussing the practice of force carbonating beer. The head on a beer like Guinness contains a much finer bubble, due to the incorporation of N2O as opposed to CO2. This results in a creamy, longer lasting head, which had me thinking... With an ISI cream charger, and a few N2O cartridges, how would carbonating with N2O effect the body/texture of a cocktail? With a longer lasting, more creamy head, could it replace the use of egg whites? (probably not, and who would really want to replace egg whites, but could this be an alternative?) With the addition of egg whites and N2O, what would the head of a shaken cocktail look like? (This could potentially be a very messy experiment, but imagine a carbonated pisco sour, or a ramos super fizz or something) I need to pick up some N2O chargers this week and experiment... Any thoughts?