You are trapped in a room with two doors...  One door lead to certain freedom and the other leads to a ton of worms that you'll have to eat.  You don't know which door goes to the worms and which door gets you out.

There are two guards in the room.  One guard always tells the truth and the other guard always lies.  You don't know which one is honest and which one is the liar.

If you just guessed, you'd have a 50-50 shot.

To figure out which door to choose, you get to ask one guard one question

What is your question and which guard will you ask?