The first player starts by naming a celebrity. The player to their left must then name a different celebrity whose name begins with the first letter of that celebrity's surname. For example, 'Matt Damon' followed by 'Daniel Radcliffe'.
Play then moves to the next player, who must name a celebrity whose name begins with the first letter of the previous celebrity's surname (in the above example this would be 'Daniel Radcliffe', so they would need to name a celebrity whose name begins with 'R', such as 'Rick Astley').
Play continues around like this, but if at any point someone names a celebrity whose first name and surname start with the same letter then the direction of play is reversed (for example 'Sylvester Stallone').
If a player makes a mistake or hesitates for too long they must drink and the game resets. If a player repeats a celebrity that has already been said they must down their drink.