The Museum of the Theoretical is, in its curator's words, "a collection of the nonexistent, the hypothetical, the pondered about, the could've-been, and the thank-god-it-wasn't." The museum is packed full of artifacts and mementos of things that never ended up happening. It is first visited by Justine in Subnormality #166. Unfortunately, as the curator (actually an alternate version of Justine herself) tells her, the museum itself is theoretical, and vanishes as soon as she realizes this fact.