Olivia is not your average smooth rider. She's a Leafer, and her reconditioned leaf springs are bouncy.
I've noticed it lately on a particular section or two of road where there are the smallest corrugations or uneven bits in the surface. If you hit them at the right speed - which is generally the reasonably-slow speed Olivia's going - you generate a "wave" effect. As you bounce up and down, you hit the next one which keeps the bounce going! Throw in a high seat box with straight up and down padding, and you look like you're on a trotting horse in the driver's seat.
A while back I was trying to explain the feel of the ride to my boss. "Oh," she said, "I guess that's like when I put my car in Sport Mode and feel the bumps". Um.. no. Not exactly. I may have to give her a lift sometime to illustrate the difference.
There are many that look down their noses at Leafers in favour of the comfortable ride of coil springs. Yes, it's nice not to feel every bump in the road, but hey - this is a Series Landy, and feeling bumps is what it's all about. However, I recently had a passenger with a full bladder on board and I don't think he appreciated the effect! :-)
That's Series Landies for you. They chug along slowly, they bounce, they bump - but they go. Generally speaking. Which is really all you need out of a vehicle anyway.
Of course Olivia is the exception to the rule - which is why new shocks are on the must-get list. :-)