The first is the giant stinging tree, or gympie gympie. The name comes from a town in Queensland called Gympie, and this member of the nettle family is common in Queensland and northeastern Australia. It’s a large shrub with stinging hairs. The hairs cover the entire plant and deliver a powerful neurotoxin when touched. One of the world’s deadliest plants, it can kill dogs, horses, and humans. An Australian Geographic article describes the pain of this sting “like being burnt with hot acid and electrocuted at the same time.”
I'm never gardening again.