Best Guess!

I am always looking for ways to encourage my students to guess. Guessing is a very hard thing for them to do, because they do not ever want to appear wrong. And yet, guessing is something that we always have to do, because there is no way to always be correct. To encourage this, and sneak a bit of science into our classroom, I made a "game" called "Best Guess!". It was really simple.
I used 2 sheets of inkjet magnets from Avery (see a this post for where to buy the sheets). On one sheet, I made 2x4 sized name tags for each student, along with the two choices for today's round. On another sheet, I made a question prompt (today's is: The bread we made is ___________________), and a cut-out star shape with "BEST GUESS!" written on it. The directions were printed on a sheet of card stock. The directions were pretty simple: choose one of the words and put it next to your name. If you're right at the end of the block, you get 2 extra tickets in our weekly drawing (which is how they earn money to buy rewards at our classroom store).
Today's drill tells the students to look on the back of the door to find the game.
We'll see how it goes...