I'm kinda curious/interested in how something like that starts up in a conversation.I once saw an absolutely brilliant tickling on a beach in Dorset. I heard laughter which naturally caught my attention... I turned to see a man holding a young woman (18-21) by the ankle so it was holding her leg out straight. He was then simply stroking a single finger up and down her sole. She was losing it , body jerking, arms flinging around, laughter that went silent. She couldn't move the leg though and he carried on slowly moving that finger up and down for about 60 seconds. It was epic