My other guitarist's sister went a a long weekend course for stage performance ages ago and they video taped everyone performing, then played it back to them. The catch was, they played back with no sound and sped up! She quickly learnt how to stop doing her "perculiar" actions.
Having said all that, as foolish as we may look sometime, at least it shows we're enjoying ourselves!
Anyone ever got caught out playing air-guitar whilst doing these?...(ahem).......lalalala...