Ellen DeGeneres loves to surprise guests on her show - remember When she scared Eric Stonestreet despite his best efforts to prevent it? - and Jake Gyllenhaal was the latest victim of her pranks during an appearance on Tuesday. Jake and Ellen were chatting about the dark roles that he's been choosing lately, When a costumed man appeared out of **where, causing Jake to proclaim, "What the f*ck?!" Be warned: you might Jump too When you watch, and if you can't get e**ugh, check out more viral videos.