Ian Somerhalder Calls Grumpy Cat a Pantydropper

The star of “The Vampire Diaries“ dropped by the Mashable house at SXSWi to talk about 50 Shades of Grey, his news/activism start-up Ryot, and the most famous cat in Austin. For more SXSW 2013 coverage (and Grumpy Cat, too!), subscribe to Mashable by clicking this link: Mashable is the leading independent news site for all things tech, social media, and internet culture.