(Video courtesy of YouTube/0fficialbjpenn) (Video courtesy of YouTube/LayzietheSavage) Just a friendly reminder that the weigh-ins for UFC 137 will be live from the Mandalay Casino and Events Center at 7:00 pm ET tonight and you can watch the stream live right here. Until then, enjoy some BJ Penn and Nick Diaz highlight reels to get you pumped for tomorrow night. Is anyone actually not excited for this fight? Tonight we will get to see which BJ Penn showed up in training camp — the one with abs…