A few years ago while muzzleloader hunting, I had one try to climb my tree..when that last foot got off the ground and I screamed (thought about jumping, forgot alllll about the gun in my hand, lol), then he screamed and flew off that tree.....the most intense thing I have ever experienced while hunting....almost shot it thinking it was a hog walking under my stand but then he popped his head out and I grabbed my phone.
Here's some pics of the 590lb. Bear that started this thread...look at his head, it's huge....




This is the one that tried climbing my tree....