"I feel quite guilty about this... I said, 'You should probably be prepared because Ellen likes to surprise you with things. Like one time she made me sing and one time she gave me vibrating things...' He was like, 'She won't do that to me. I'm a first time guest.'" Jennifer Aniston on helping pal Ellen DeGeneres trick her boyfriend Justin Theroux into showing off his breakdancing skills during his first solo TV chat show interview. Theroux, who appeared on Ellen on Wednesday (22Feb12), insisted he couldn't perform his party trick because he wasn't wearing the right shoes - but Aniston had picked out the sneakers and sent them to DeGeneres in advance.