Voice actor Nick Landis took his girlfriend Erika to Walt Disney World a couple of weeks ago to propose to her. As the big moment was being photographed, this poor soul stepped in front and immediately realized what he did. It's a moment that will live forever, because Erika posted it to reddit, where it made the front page this morning. But that was just the beginning. The same tourist has apparently photobombed other significant events, which made him an instant meme called InTheWayGuy. Link
Still, the fact that he's making that pose and face means that he knew what he was doing.