AMS/Stockholm, after a 1st LIS/AMS on a B767, on the good old days KLM had a bigger airplane service to Lisbon!
I have never been on a 400 series B-737, and amazingly, never again too...
I was horried that because of the snow conditions the flight would be horrible, but it was just fine.
In fact, not knowing exactely why, I never got bad turbulence on KLM. And I flew it a lot afterwards...