Google stinging tree or Gympie gympie...

Account from someone that touched one...
"For two or three days the pain was almost unbearable; I couldn't work or sleep... I remember it feeling like there were giant hands trying to squash my chest... then it was pretty bad pain for another fortnight or so. The stinging persisted for two years and recurred every time I had a cold shower...There's nothing to rival it; it's ten times worse than anything else"

It's in a glass case here because the spines can blow off and become airborne causing respiratory effects.

This one was in a cute cafe stop by a lake when we were driving back to cairns today