You need a large round glass. Like a fish bowl glass.
1oz of tequila
Lime margarita mix
Mix and put in your large glass
Then take a bottle of Carona-open it and flip it upside down into the margarita mix. Let the beer bottle stay flipped upside down because when you drink the beer will slowly poor out into your Margarita not making it too runny. It's really good! Enjoy