Ask the group to stand up and form a circle. Everyone takes turns saying a number starting with 1, 2, 3 and so on. Of course, there is a catch. At every number with a 4 in it or a multiple of 4, that person needs to say BUZZ instead of the number. The next person just continues the series as normal.
For example: 1 - 2 - 3 - buzz - 5 - 6 - 7 - buzz - 9 - 10 - 11 - buzz - 13 - buzz - 15 - buzz - 17 - …