the worst type of stinging nettles which put him on the ground vomitting after barely brushing the top of a leaf with two fingers.
I'll pass on the Funnel Web spider (death in 15 minutes) or the Red Backed Spider which is a larger more venomous cousin of the Black Widow. Funnel Webs like swimming pools so you have to be careful cleaning the filters, or even going in the pool as they can survive at the bottom of a swimming pool for 4+ hours, step on it and you're in deep trouble.
Dr James? Leahy, a British virologist with an addiction to being bitten allows all sorts of jellyfish, ticks, spiders and other biting insects or arthropods (that's ticks and spiders) to bite him. The last two programs I've watched were filmed in Australia home of all of the worst biting insects jellyfish snakes and spiders one can imagine.
He chickened out when faced with the Irikanji jellyfish which was described by a marine biologist who studies them as If you ask people to rate it on a scale of 1 to 10, 10 being the worst pain you can imagine, people rate this at about 14 or 15.
Neat, if somewhat stomach churning, program.