You Probably Missed This One Thing In The First "Harry Potter" Film
Remembralls are so useful.
This is a Remembrall. It turns red when the user has forgotten something.
Its most famous user is Neville Longbottom, who can never remember what he's actually forgotten.
But in fact, it's really obvious – he forgot his robes!
And it's probably a good thing he eventually remembers them, since they end up saving his life a little while later.
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