Like base jumping and other dangerous pastimes, do it often enough and there's a significant chance of getting killed. My sympathy is with the poor driver minding his own business driving up the hill who suddenly sees this nutter on his side of the road coming round the blind bend.
I'm afraid I haven't seen any, but I presume the (false) British accents are either Cockney or RP! I suppose they wouldn't even understand a Geordie one.