Originally Posted by Sir Pantalones
*Time machine appears, out steps Past Sam*
Sam: "Well this is awkward..."
Sam: "Did your best friend also turn into a giant monster with psychic powers, forcing you to kill him?"
Sam: "Yeah, pretty much."
Sam: "You crack me up, identical buddy!"
And then they walk into the city with the text "Sam & Sam" showing up on the screen.
Knowing that Max will blow up, Sam also saves Superego from Max's body. Max blows up in the depth of space (although if what made Max regain his personality IS Max's Superego curing his tumor, this creates a plothole), and Sam finds Past Max in the elevator again. Max, later faces his Superego.
Sam: So, we can't call you Max's Superego all the time. You have the vast freedom of choosing yourself a name, now that you're completely free from the restrictment of Max's personality and behavior.
Max: But make sure your name forms some kind of a pun or throwback to being a part of personality or something. People dig that kind of stuff.
Superego: No! I am now a completely different entity. I'm now responsible about my sanity, not yours. So it should be unique. Say, I was thinking of the name-
Max: Ooh! Ooh... EDMUND REGO!
Sam: Why? I don't hate it...
Max: 'sup, E. Rego!
Sam: Oh... Well... At least you don't have to live with these hilariously painful jokes for the rest of your life.