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WSJ's Joanna Stern "bumps" into Philip Krim in the elevator at D.Live and asks about Casper's possible IPO, and pitches a mattress idea of her own. Photo: Andria Chamberlin for The Wall Street Journal Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM