Only had one.

'05 season I got off work early and got up a tree. "Something" didn't feel right (I was in my climber). Something told me to get down.....and I did.

I moved 200yds to a lock-on I had set.....and climbed up. Same feeling. I sat there about a minute and climbed down and walked home.

Can't explain it.....but I havent felt it since. If I ever do, again, I'll do the same thing.