[ Interesting. In Sans's case, he hadn't heard it posed to him like that, which leads him to suspect that maybe the explanation upon arrival is tailored a little to the individuals coming through the portal. Which... makes sense, and it isn't enough to think there's some grand conspiracy going on. The 'greeters' seemed like, uh, pretty decent people? Cautiously sympathetic, that's probably the term he's looking for.

After all, they're quarantined here to make sure they're not a danger to each other.

That expression Terra's wearing, though... looks to Sans uncomfortably close to pity. ]

Spare me the pity, pal-- [ He chuckles, waving that off. ] --me and my kind have been living underground my whole life, is all. Anyway, many-worlds interpretation? Fuhgeddaboudit, just a, y'know, sci-fi thing.

[ Can't tell if he's too lazy to explain or just unwilling to get into it. ]