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    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.

    Warner Bros. / Via

    Its most famous user is Neville Longbottom, who can never remember what he's actually forgotten.

    Warner Bros. / Via

    Which is a major flaw in the device, admittedly.

    But in fact, it's really obvious – he forgot his robes!

    Warner Bros.

    Everyone else at the meal is wearing robes, except Neville.

    And it's probably a good thing he eventually remembers them, since they end up saving his life a little while later.

    Warner Bros.

    Via Tumblr