Just take a glass with a bottle of Coke and pour straight down – similar to what you'd do with a Guinness at home. As you begin to draw the bottle back from the glass, you'll naturally slow down ...
So to try it out yourself, pouring a glass of Coca-Cola and swerving the fizz can be done pretty simply. Just grab a glass and bottle, then pour it down straight – imagine like a can of Guinness.