It probably went like this: Hey lets put a car behind three doors, have people choose, open one of the other two doors, then ask them to switch. Sounds good B

It probably went like this: Hey lets put a car behind three doors, have people choose, open one of the other two doors, then ask them to switch. Sounds good Bob, but wait, won't the show end prematurely 1/3 of the time because you will randomly open a car? Huh, good point. Um, let's sneak a peek before opening so we never open a car? Sounds good Bob.