A completely unrelated video, such as a cartoon or a low-quality home movie.
A short, nonsensical clip intended to confuse the downloader.
Today, "Daring Rubbercats.avi" serves as a nostalgic touchstone for those who grew up during the transition from dial-up to broadband. it evokes memories of waiting hours for a 20MB file to finish, only to find it was a mislabeled clip or a corrupted mess.