You're looking at this insect and hoping it's a close up of some tiny little bug. But no. It's a giant water bug, complete with an array of eggs on her back.
I've had very painful encounters with water bugs (they pack a nasty bite). These predators (family: Belostomatidae), are also known as toe-biters, and can reach upwards of 12cm (well, some species at least). They are native to North America, South America, East Asia, and your own personal nightmare dreamscape.