In a recent news story, an alleged 'ghost' was caught on tape by a gas station security camera.
Here is the video: http://www.kmov.com/video/topvideo-index.html?nvid=192110&shu=1
Upon first glance, the security video footage appears to be definitive evidence of a ghost. However, after examining the entire sequence numerous times it is extremely hard for me to conclude that a true 'ghost' has been caught on tape.
The more logical explanation is that some type of bug is crawling on the security camera lens. Any experienced camera operator, logical UFO investigator or ghost hunter has to be aware of bugs and dust on the lens. Otherwise you are setting yourself up for a rise in blood pressure only to be let down by the truth. Take my word for it.
The most intriguing aspect of the film is possibly the blue hue of the object caught on film. But again, this may be affected by a number of different elements such as the security cameras lack of quality, poor lighting, and possibly, the extremely close proximity of the object to the lens.
In the end, it is easy to admit that whatever this mystifying object may or may not be (bug, ghost, angel, etc.) it sure does spark the imagination.
Lastly, my advice to you is simple. There is FAR better evidence to support life after death and the existence of spirits than what this particular event provides us.