The real evidence for UFOs is slim to none.

There's a guy who's hobby is making crop circles. He has to document his plans with drawings, dated,registered letters, etc..ahead of time for absolute proof that he was the one who created the crop circle, and still the UFO nuts are out there claiming aliens did it and calling him a lier.

The sad part is, if there really was any credible evidence for such phenomena, no one credible would touch it because all the kooks have the subject so throughly buried in 'fringe' bullshit.