Node and/or socket io multi-player whackamole

So, let's say I wanted to create a multi-player whackamole game.

and... I emitted the mole which shows up on screen in multiple client browsers, potentially 20 or 30 clients, all displaying the same mole at the same time. and... Several of the players click that same mole at the same time...

How do I determine who won and deal with collisions or ???

I don't really want to create a whackamole game but this is the easiest way I can think of to explain the issue I am having at the moment.

Any help is greatly appreciated, thanks in advance.

via Todd