A couple of years ago I had a old Honda 250 Wet Dream as a winter hack and couldn't stop anywhere without guys coming over and wittering on about how they used to own of those/it was their first bike etc etc.
On the 'don't have a clue' side, I once pulled up on my old Buell Ulysses, (they have a small fan to cool the rear cylinder which continues to run for a short while after you switch off until the cylinder cools) and started to walk away. A guy stopped me thinking that the noise of the fan whirring was the 1200cc H.D. engine still running!