Here's a bus shelter being fitted with augmented reality technology.
This woman thinks a meteor's heading right for her.
This guy was remarkably sanguine about a tentacle grabbing a nearby pedestrian.
But this chap was rather more concerned about the tiger heading straight for him.
Meanwhile this guy was just kind of bewildered when a few UFOs showed up.
Watch the full prank here - and see if Londoners were smart enough to work out what was going on.