Not Mad

Occasionally I tell people about my interests in radio controlled yachts and gliders, if they appear interested I'll go into some details etc.  Sometimes to impress them I'll say that a glider can achieve speeds in excess of 400mph.
At this point they usually give me a certain look, like I'm seriously in need of therapy.  But it's true, I am going mad..........not.
Oh and this vid is almost a year old so I doubt it'll be long and I'll be telling people that radio controlled gliders can reach speeds of 500mph, and then watch their expressions ;-0