I had one hitchhiker who had never been on the back of a bike. Almost
crashed at every corner.....then I figured out that she didn't like leaning
with the bike. We were fighting each other at every bend.

The other no-no is wiggling all over the place just as you are trying to stop
just when control is nil.
I don't carry many passengers, but those that do ride with me get a short
lecture on proper etiquette

Jim