Warning: This video contains explicit language.
It's hard to tell what's going on at first, which probably makes it more ominous: a woman's voice yells "It's coming!" as lights flash and an electric buzz grows louder and louder.
In the video above posted to YouTube Friday the sounds and flashing light culminate seconds later with a pulsing blue "fireball" that moves slowly along a power line in Lachine, a borough of Montreal. It's a bizarre scene that several people observed in the comments section is closer to "Back to the Future" than anything most of us ever see in real life.