So what would you do if you were introduced to Jude Law and promptly fell off your chair? Personally, we'd either run from the room crying - or carry on as if nothing had happened.
However, as you can see from this video, when reporter Poppy Jamie took a tumble at a press junket for Anna Karenina, she dissolved into helpless giggles. And then Jude started laughing, too. And later on, even Keira Knightley joined in the chuckles. What japes!
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Still, you'll be pleased to see that both Jude and Keira had recovered their composure in time for the film's London premiere on Tuesday...