UFOs at night

Have you ever seen a "documentary" on UFOs because I have. It talked about these people seeing large bright lites flying in the sky at night. With the people they were interviewing they promptly branded them as UFOs. After that they immediately started talking about how the Canadian government covered the incident up. It pointed to two words in one(1) Canadian government document: UFO sighted. One wonders why they did not interrogate the author of the document.