Hi Bryan Here…
Well the correct term is Monocycle, and yes they are a real thing. Here is an image from the new ‘Men in Black 3’ film where we see Will Smith and James Brolin riding one of the Mono Cycles. From what I remember, Will Smith travels back in time and meets the younger version of Tommy Lee Jones played by Brolin. I hope part 3 is better than 2. And I must say…this monocycle looks very familiar. What do you think?
