There are hundreds of examples of science fiction becoming reality from submarines to moon landings to lots of more mundane examples. Star Trek communicators? Now we all have cell phones. Light sabers? Well, I'm still waiting for mine.

In the meantime, we have the increasingly popular Flashmob. I recall Larry Niven coining the phrase to describe when people would teleport to a location to see a newsworthy event, causing extra stress to local infrastructure and possibly getting themselves hurt in the process. It's the future version of 'rubbernecking' - slowing down and gawking at an accident along the side of the road.

In Niven's future, the police would reroute the teleport terminals in the immediate area of a situation to automatically deposit the curious into holding cells for later processing. We still don't have teleportation but we do have near instant communication, allowing many people to show up somewhere simultaneously.

Granted, the above example of a flashmob isn't exactly the same as Niven's vision but neither are many examples of science fiction predictions. Still, the future is very quickly becoming the present.