You participate in a game show where you must choose between 3 doors. Behind 2 doors is a goat, but behind 1 door is a car. You pick a door, say door no. 1, but before you open the door, the host opens another door, say door no. 3, which has the car behind it. "Oops," says the host.
You lose.
There's a goat behind two doors and a car behind another?
Pick the door which would accommodate having a car and not the two door which accommodate a goat.
Goats aren't that big, so the door which isn't right next to another door (Certainly not the middle door if they are all close together).