You just need a clock with a second hand and some willing friends.
Each person chooses a number between 1 and 60 which corresponds to a second in the minute. When the second hand of the clock passes the first number chosen that person must start drinking their pint and finish it within 60 seconds. When the second hand has returned to the number for the first player (i.e. when their time is up) then the clock starts counting again until the second chosen number is reached at which point the person with this number starts drinking.
More Drinking Games
Each person chooses a number between 1 and 60 which corresponds to a second in the minute. When the second hand of the clock passes the first number chosen that person must start drinking their pint and finish it within 60 seconds. When the second hand has returned to the number for the first player (i.e. when their time is up) then the clock starts counting again until the second chosen number is reached at which point the person with this number starts drinking.
More Drinking Games