OK, this one's pretty far-fetched, but also a hoot. As can be seen in the above clip, a figure can be clearly seen in the background, by the window. Somewhere along the line, a little urban myth popped up about the figure, stating that it was the ghost of a boy who had died in the house they were filming in, and that he was caught on camera because even ghosts want their 15 minutes of fame.
Which could all be true. Or, more logically, a cardboard cut out of Ted Danson. Either way, not that freaky. Now, the crazy facial hair in this movie? That's the really scary part.