Michael Phelps has kicked off retirement with a bang. After his first quasi-retirement back in 2008-09, the guy was caught ripping a bong, so it only makes sense he goes nuts for his actual retirement. The guy hit up Vegas and let loose at an Encore Beach pool party over the weekend. Brunettes were left and right splashing around and enjoying cake with the 22-time Olympic medalist. We give the guy three years until he's broke and/or becomes and alcoholic. JUMP!