Hans is brainwashed into thinking he is the son of Homer and Marge. Homer compares kissing Hans on the forehead to kissing a peanut.
Hans: "Mom, dad, I missed you."
Marge: "Homer, that's Hans Moleman."
Homer: "Can I keep him anyway?"
Homer: "And now I want you to meet your new brother, Hans Moleman."
Hans: "Cowabunga dudes."
Homer: "Give it a try, it's like kissing a peanut."
Marge: "Homer, I want that thing out of my house."