A concentration warm-up.

All players stand in a circle and count upward, one number per player: '1', '2', '3', etc.

Whenever a number contains a 7 (like 7, 17, 27) or is divisible by 7 (like 14, 21, 28), the player must say 'Buzz' instead of the number.

If someone makes a mistake, the group starts over from 1.

A correct sequence sounds like: '1-2-3-4-5-6-Buzz-8-9-10-11-12-13-Buzz-15-16-Buzz-18-19-20-Buzz...'

Variants:
- Use a different number (e.g. 3 or 5)
- Change counting direction on each 'Buzz'
- Add a second forbidden number