"Australia, where it seems everything has evolved to kill humans."
Actually, it's not true that things in Australia have especially evolved to kill humans, whether it seems so or not. For example, almost all snake deaths are caused in countries where there are lots of people, and where snakes have thus evolved to live among humans. Unfortunately, folks seem to rate snakes on how well they kill rodents, of which there are plenty in Australia, and which the local fauna has evolved to bite.
"Although mouse tests (commonly called LD50 studies) are important so researchers can have standardized baselines for venom studies, they really have very little to do with what happens when a snake bites a human. LD50 is the smallest amount of venom (stated in milligrams venom per kilogram mouse weight) that when injected into a standardized group of mice will kill half the subjects. Many standard lists of the most venomous snakes are based on a study published in 1979 by A. J. Broad and colleagues working out of Australia, which partially explains the strong Australian bias of the list. The well-known venomous snakes of the Americas, Africa and Asia are mostly absent from the list and simply were not included in the study."
All that said, St. Patrick had the right idea.