Man I wouldn't know where to begin....
Done a few K's over the years.
However I suppose my non-stop solo trip from Sweden to Holland at about 1200K's in a rattly old Volvo 144 would be up there.
I picked up a hitchhiker somewhere in Germany to keep me awake.
He invited me in for a cup of strong coffee and he had the most amazing apartment.
His girlfriend was a furniture designer and the whole place was filled with the most outrageously awesome stuff I've ever seen.
When I was leaving I asked how to get back to the Autobahn, and he said "I'll come with you and show you"
I drove for about 5 minutes, taking note of all the turns so I'd remember the way, thinking I'd have to take the guy back to his place again and then drive back by myself.
When we got to the last turnoff he just said "Follow this road and it'll take you there" and jumped out of the car.
"I'll run back" he shouted as he disappeared in to the night...
I kept driving til I passed the Dutch border and I just had to pull over and have a snooze on the side of the road before I continued.