I have a good one but it'll be hard to describe...
I was deadwooding and clearing a big pecan over a 2 story house, tied in to a central crotch with a redirect about 20' toward the house. I teetered waaayy out on a limb over a dormer on the roof and was going to jump onto the roof where I'd staged a polesaw to do the clearing. The roof was pretty steep so, from the ridge of the dormer to the bottom was a good 8'.
I was directly over the dormer bobbing on 3" wood, it was about 4' to the ridge so a good 12' above the roof proper and about 40' away from the tree trunk. I slacked out lots of rope, looked back at the mammoth swing I was facing, wished for a safer occupation and jumped...
...I didn't slack out quite enough rope so I mostly missed the dormer and went winging away over the roof completely out of control, flipped upside down and almost hit the trunk before swinging back in and landing on the roof.
It's hard to describe how wild that swing was and how lucky I was to have missed slamming into the trunk upside down and out of sorts. It was really fun! ...but I wouldn't do it again.