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Fast bouncing
My colleague has got a tendency to bounce up and down really really quickly and silently on his chair. Kind of like he's shyly rocking out to some gabba. Except he's not listening to anything at all.
I'm pretty sure he hasn't got a degenerative rocking disease.
I find it almost unbearably irritating, but I can't just shout 'STOP BOUNCING!' at him. Can I?