"What?" Baby asks, looking back and forth between Frank and Dean, trying to figure out why everybody suddenly seems unhappy and/or angry.

He doesn't quite have the insight into the issue that Frank thinks he does. He's a little simpler than that, still. He doesn't know about the relationship that Frank and Dean have, but he thinks that if Dean is trying to replace him and he looks identical to Frank, Dean must be trying to replace Frank, too. That makes sense, right? Because Frank must also have been a car at one point.