This is truly cruel, and for that reason it's also very awesome. I've never considered doing this, but now I might have to buy a pair with dinosaur footprints. That'll really mess with people. When you usually make fake footprints you get pretty bored with doing it, so the footprints don't last too long. That's how everyone knows they're fake. If you walked around all day in those footprints, everyone would definitely believe it. It sounds like this person's neighbor definitely believed it.
There's something troubles about this photo. It makes me really doubt the existence of bigfoot. If the footprints are fake, then everything is fake. It's not like we'd find out the footprints weren't real and then think, "I guess he must have been stepping somewhere else that we never saw."