As the proud owner of an 18-month-old toddler, I can say definitively that they get into everything, find things you thought were lost years ago, and merrily bang on and play with whatever fits in their hot little mits. However, I think this one deserves a gold star or something:

A quick splash in the backyard turned into an emergency when a central Queensland woman discovered her toddler playing with an old World War II bomb.

A close reading seems to indicate it was in fact a practice weapon and not dangerous, but you couldn't tell just by looking. I'm enough of a weapons nerd that I think I'd recognize it right off. Which only means I'd have a heart attack faster than these people did.