I post 4 doors.

Player 1: picks a door

Player 2: decides whether that door leads to something good or something bad and says what it is.

Player 3: picks a door from the next 3

Example:

Player 1: Door 3

Player 2: The door leads to a room with puppies! 

Player 3: Door 1

RULE: You can't go back through a door and choose another.

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You are in the middle of a room. Around you are 4 identical doors, marked 1-4. There is no indication as to what lies beyond each. You only get to choose one. 

Which do you choose?

I pick Door 1!

The door leads to a room with a foal!

I pick door 3!

The door leads to a room filled with stinky fish!

Door 2