First, turn down your volume slightly. Next, check out this video for a last bit of pre-Christmas cheer: [HTML1] That’s Hospitalman Apprentice Robert Everhart, surprising his girlfriend, Michelle Gungon, with a marriage proposal at Sharp Memorial Hospital in San Diego on Monday. Robert, attending “C” school in San Antonio, came home a day early. “I was expecting to see him today at 5,” Michelle said in a Christmas Eve interview. “I had this whole thing planned out.” She said yes anyway, to the applause (and loud cheers/shouts/huzzahs/etc.) of her co-workers. Robert, 30, comes from a Navy family — his father…