Not quite sure in which category to post this one, as I have no clue what it might be. Some kind of gas/electricity/plasma related phenomenon? A reflection? (Nah.) Fakery? (Always an option.) Source: https://www.youtube.com/watch?v=T0f1QHv-Vfo As far as my Spanish goes, they're repeating "It's walking!" Don't know if there's any more background (other than this being the non-stabilized original - maybe there are clues in the Spanish comments), just stumbled upon it in the UFOs subreddit. Curious to know what you think of it. EDIT: Right, it's fakery. I don't understand enough Spanish to know if it was done in post production or not, but it appears a Bugs Bunny balloon was involved: Source: https://www.youtube.com/watch?v=1tUYzTf2E48#t=6m40s Once you see it, it's kinda obvious. D'oh!