I did that in my '68 years ago.  Left a campground to go to the store in the
dark (probably for more beer), got on Highway 101 and at 45 mph the noise
finally tipped me off.  Lucky I didn't rip the canvas to shreds.

Stuart

David wrote:

I guess that, along with driving the Westy seven miles once with the top
up,* are my big stupids.  Signing up to help moderate the list I have no
regrets about.  Yet.  <g>

*It did seem a bit sluggish once I got to 45 mph, but that's as fast as I
was going.  It was night time, going from my folks' house to a friend's
along countryish roads.  Got to my destination, turned back to shut the door
and almost had a heart attack.