Clear three feet of floor space.
Spin in place three times, slowly. Stop. Wobble for comic effect. Repeat.
Kids will spin until they fall over. The fall is the funniest part to them. Older kids will count the rotations and try to spin faster.
"Spin and freeze when I clap." "Spin like a leaf, spin like a tornado, spin like a sleeping cat." Add directional cues — left, right, slow, fast.