Nope, Can't stand it. I enjoy a good story but that show is just full of lies and ridiculous animations. Ancient Aliens is a typical "History" Channel work of BS. 99.999% of all UFO photos/videos are faked with the intention of selling it. Only a few are from real people who see something that they didn't expect. Much like the Loch Ness Monster or any other supernatural myth.
U.F.O. stands for UNIDENTIFED Flying Object. Those people on Ancient Aliens claim to know it all. None of the honest sightings have ever been positively identified. Notice the extreme reduction in UFO stories since the invention of affordable HD cameras. A crisp HD picture of a fake UFO isn't as good as an old blurry photo.
I'm actually one of the most skeptical people you'll ever meet. Until ET comes to my front door and introduces himself then I'll continue to have serious doubts about ALL UFO encounters. If you've seen a UFO then most likely it's something being operated by the US Government.
Here's a picture I took when I was 10. It's an amazing photo that some would drool over.
In reality, it was a McDonalds UFO Happy Meal box thrown into the air and I snapped a picture with a cheap camera.