conversation stopper
stopper ,

The Napoleon was a conversation stopper that will feed four.

It was, as they say in Maine, a real conversation stopper.

Or a conversation stopper, depending on what you wanted to do.

As a remark, it was a guaranteed conversation stopper.

It's quite a conversation stopper if people don't know about me and ask.

One conversation stopper after another, Patrice thought; the creature was full of them.

Steiner is a great master at such conversation stoppers.

What will he mean in a perhaps not too distant time when homosexuality has ceased to be a conversation stopper?

That's what is known as a conversation stopper.