We're not saying it was as bad as Joaquin Phoenix's recent appearance on the Late Show, but Blake Lively's visit to David Letterman last night was still pretty bizarre, from her strange, ill-conceived opening joke about having a three-way with the host and Julia Roberts (ew) to a story she relayed about once being taken to "Disney Prison." "It was a small white room, and all of the furniture was miniature," she says. What? Then, at 6:16, she barks. Is Serena using again?