Pawn promotion but no extra queen piece?

If you promote a pawn to a queen and there are no extra queens, how do you represent a queen? What did they do before sets came with extra queens?

Turn a rook upside down? Use a coin, button, whatever.

when i'm in time trouble, I just use the promoted pawn as a queen. when I'm not however, I turn a rook upside down.

LOL I can picture Carlsen moving pennys and buttons in the next WC!

Upside down rook sounds a lot better than just snatching a queen off of someone elses game 

Thanks for the responses.

Sigh. To have two queens... such a distant dream. If only I had those kinds of problems.

ok revived great...

We need tiny hats for the pawns, like a little crown that just clicks to the top