...he couldnt beleive it he just stopped alongside shaking his head
...and you failed to notice the tears of laughter running down his cheeks
(bet it was when you went through your Knight Rider phase
)
As per Mike, if safe to do so, I always move over to ensure a biker knows he can have safe passage past me, in fact, if any vehicle is making better progress than me, then I have no problem in them overtaking (safely) me.