Mischief Managed.

I know, I know. Nobody remarks on the fact that Lappypoo obviously isn't imaginary at all. Robot can see him and shut him down, so he must be an actual thing. It's a complicated concept that would require at least one thousand more panels to properly unpack. Let's just say that whatever we imagine can be real in our hearts. And that sometimes the line between reality and fantasy is dangerously blurred. The moral, though, is to do your evil with an adult. Preferably an experienced parent.