This is a common technique used in mixing shooters. It might be slightly challenging at first. So, expect a flop or two before perfecting it. Using a pourer on the bottle makes it much easier.
As a rule of thumb, spirits with a higher alcohol content have a lower consistency and tend to float on top of those with a lower alcohol content. Therefore the stronger ingredients tend to go into the glass last.
This is not always true though, as some liqueurs – like cream liqueur - tend to be thicker and heavier without having a very high alcohol content. In most countries, the alcohol content of the drink is printed on the bottle’s label. A good shot recipe will tell you the order in which to layer.
Shooters are often consumed to celebrate. They also do wonders to get a party going. But a word of caution: they have a tendency to creep up on you. So, don’t overdo it. (Click here for our Hangover Cures Guide. Remember prevention is better than cure.)