Another true story to tell (not my own though).
VFR scenic pilot tries to out-run low clouds to go up a long narrow valley but the cloud came in behind him and blocked off his only exit back down the valley. He had to stationary hover 20 minutes with no visual references except the tip of a tree just visible below him. He managed to grope his way home after the clouds cleared but he told me he had learnt his lesson and never did it again.
