Worst case of that I've ever had, was in the woods.
In the local State forest there is a stand of old oaks which are genetically as near perfect for here as you can get. So every year they put cloth under them and catch all the acorns for seeds.
The results are some amazing, near identical oaks, that are REALLY hard to thin, since there are almost no bad specimens to cull. You end up just counting meters between them instead.
One of those was split in a storm and was threatening to ruin two others, so I got a call to come take it down.
We did it by the simple means of me climbing up and setting a choker around the top of the log, then pulling with a skidder, as we felled it as if it was still one, intact tree.
It was a windy day when I spurred up that one, and the split kept opening and closing as I went up, pulling me into the log and letting me back out as my lanyard was around the whole tree.
Man, was I ever aware of where I put my fingers!!
That was back before throwlines and SRT. Today that job would have been a walk in the park.