Seen this on the TV today, now obviously I think this is overkill and completely ridiculous!
But... my dad used to tickle me until I was hysterical, I would beg for him to stop and really really mean it. I couldn’t breathe or speak and I’d be crying my eyes out (not with laughter). He thought it was funny but I found it horrific. Even now as an adult I’m traumatised and can’t even be tickled by my partner whilst messing about 
I tickle my own children as a joke and only for a couple of seconds and I would have no problem with anyone else tickling my children either in a loving, fun way.
But to me there is a point where you cross the line of consent with it. It’s just at a really extreme end of the scale. What does everyone think?