I'm a bit surprised no one posted this yet. In her interview, Anna Kendrick compared laughing in a corset and all of a sudden panicking for air to that moment being tickled where it stops being fun. Paraphrasing and it's a little longer than that, but some kind soul will put up a clip, and the whole episode will be on cc.com tomorrow. Certainly gave me a jump while half paying attention to Jon talking to Scott Pilgrim's sister.