This activity is good as a drama warm-up or a PSHE circle game.
The class stand in a circle with their heads bowed. The teacher (or a child) commands, “Look Up”. When told to look up, pupils must look at someone else in the circle. If the person is looking back at them, then both are out – so they both sit down.
Then “Look Down” and “Look Up” again. This repeats until a few remain.
I add the rule that pupils should look at a different person each time to avoid repetition.