It's got two wheels...

...and two frames?  It's a double decker bicycle!

Best photo I managed to get, despite me and Dave following the poor man along the road.  I'm expecting the police to be waiting for us tomorrow, cos that's the second time we've stalked the poor bloke.  Never mind, it was Dave driving!

We spotted him a few weeks ago cycling along the riverside in Stockton, on our way to work.  Due to being responsible adults, we haven't actually acted on any of our plans to pull out in front of him unexpectedly just to see how he stops and starts on that thing.