Ha, I thought nobody would ask. It probably will be quite a disapointing story though, sorry.
Anyway, I was on holiday in Slovakia and basically, they just have old sovjet jets sitting around. We visited a very small "airport" (the runway was grass) used for skydiving. And they just had a MiG-21 sitting behind the building. No fence or anything. One of the Skydiving company staff said I can sit in it, if I want. So I did. He didn't come with me or anything. It was also out if sight from anyone on the airfield.
Apperently this isn't unusual at all and these planes are just sitting around in random fields as "decoration".
Yeah, don't do that. To be honest, I didn't even close the canopea fully, I worried about not getting out. I sat on the wing for most of the lenght of the joint.
There was another plane, I think a MiG-15, that was literally just sitting in the middle of nowhere next to a hayball. We were just driving past it. I tried to find it on google maps, but it was many years ago and I just can't remember the route .. or any waypoint.