Well, it's kind of a guess that you're a different Neville. No offense or anything, but you seem more smug than the one that's usually here. And we're kinda having a bit of an epidemic here where people are being switched with people from alternate universes. Like Ron suddenly isn't Ron any more. He got switched with Ron Malfoy, which is seriously creepy and I hate it. And his future daughter Rose... well, she got switched, too, and it made things even more complicated.
We've got some telepaths here and they've been looking into minds and stuff. No, they haven't been screwing around. But they can confirm that these people that suddenly aren't acting like themselves are from alternate dimensions.