Can you explain this strange phenomena?

Question

Please keep your replies civil enough for a public forum and take the question at face value without automatically assuming that the account is the result of inebriation, psychosis, or the fabrication of a wild imagination.

I have a friend that says that he has seen something strange in his apartment. He says he woke up after a power outage and got up to get a flash light and he saw, in the corner, a large glowing body of mist. He does not believe in disembodied spirits. However, he and I have been trying to explain it. There was another incident where he caught similar mist from the same corner of his apartment in a photo. Each time he has seen this it has been near the utility closet where the air conditioner and hot water reservoir are stored. Obviously, I am not an electrician or plumber. As such I am not certain what could be causing this, however I have a hunch. (see below)

Answer 1

probably a reflection or yeah, a small gas leak (something which is close enough to being a liquid that it refracts light) - if it was night and he had no light, i.e. no torch, just saw a glowing ball in pitch black like a lamp.... then either someone is pulling the funniest prank on him or that be sh#t be freaky!

Answer 2

Try using a ouija board and attempt to contact any spirits that might be around.