Soccer, playing the guitar, video games, reading, spending time with friends, watching movies, Sherlock, Game of Thrones, Mr. Robot, Metallica, RHCP, Green Day.
Okay now *I'm* going to jump in and say D is MY nickname for him. Juuuuust saying. You can call him Prof. D, but just D is totally mine!!! lool. But no for realz. :)
