What do you do to keep hold of a conversation thread when an AMOG is trying really hard to steal it?

I've been using a penguin opener that looks like this:

Me - Hey guys, I'm trying to settle a bet with my friends, do you think a penguin tastes like chicken or fish?

It's not the best opener in the world, but it is a little different and the conversation can go in a lot of different directions, I rarely just get a one word response, so I like it a lot.

Anyway, I've noticed a few times that the AMOGs will pick it up and run with it, I've never been froze out with it, but straight stolen. How would you go about dealing with an AMOG that is clearly dominating the thread, i.e. penguin jokes, etc?

My instinct is just to let him talk a little then keep asking the individuals in the group for their answer whenever he gets too far.