An ad for Tipp-Ex seemed to have made quite a splash recently. A video was uploaded to YouTube entitled "NSFW. A hunter shoots a bear!" This video shows a guy brushing his teeth in the woods when a bear approaches form behind. He and his friend both freak out and he grabs his gun and points it at the bear. But then the unexpected happens --- this becomes an interactive video. The user gets to pick "Shoot the bear" or "Don't shoot the bear" and they're lead to a new video, where the hunter uses Tipp-Ex white out to white out the "shoots a" in the video title, allowing the user to then type in what they'd like to see him do with the bear.
Some of them are pretty funny. I personally like "A hunter dances with a bear"