We already know that Justin Bieber's recent acoustic concert in Toronto was all kinds of lit, as he broke out special covers of Drake's "Hotline Bling" and the Beatles "Let It Be." While basically everything went as planned, the Biebs did have one slip-up when he forgot the lyrics to his song "Christmas Eve" and let out an F-bomb when he realized it. The whole thing was pretty funny and the audience even shared a laugh with Bieber before he went into the second verse. Most people probably already forgot that Bieber made a whole Christmas album back in 2011 anyway, so he gets a pass on this one.