Stinging nettle (Urtica spp.) can sting and hurt for a few minutes but it’s completely benign when compared with Gympie Gympie (Dendrocnide moroides). According to Neil blogging on jennifermarhasy.com, “[c]ontact with human skin can cause extreme pain, starting as a rapidly intensifying burning sensation. The pain may persist for days, but upon exposure to cold air, water or when rubbed, the pain can be reinvigorated for up to two months or more, beyond the original sting.” Crikeys. I have a new found respect for Australian foresters.