Anna Kendrick is laugh-out-loud funny with her words on Twitter, fact. But, she's also amazing on Instagram video, too. With the news that her Pitch Perfect song Cups (When I'm Gone) is still in the US charts, Anna posted her filmed reaction with the caption: 'How I feel about having a song in the Billboard top 10 for five weeks. #ItDefiesLogic'. Watch it here now. Pretty. Genius.