Early on in development, Carl (the old man from Up) was shown carrying a giant egg throughout the film. This subplot was eventually removed from the final film, however. But why was Carl, at one point, carrying this mysterious egg? Pixar’s Pete Docter, director of Up, has revealed the details to MTV Movies Blog.

“That was early on. We had the bird give birth to this egg, and Carl then felt like he needed to take this baby — it needed tending to, and needed to get home, get away from these awful dogs and things. [The egg] had a larger picture involved with Muntz. Muntz wanted the egg because it was this youth potion that made you grow young.[Muntz] was after the bird and all that; it was really interesting, but it kind of got more bizarre… it was an element that we dropped out from the story.”