Some of us on staff here at DCist are unrepentant video game nerds, so we couldn’t help but notice this posting yesterday on the gaming site Penny Arcade about Marissa, a 9-month-old Annandale, Virginia, resident who was diagnosed with a rare pediatric condition called Infantile Spasms (IS). Marissa’s dad, being a gaming fan like us, sent the guys at Penny Arcade an e-mail asking if they could take one of Marissa’s three stuffed bunnies named…