In several regions snakes!

The United States is not immune to these occurrences. In Texas, a woman discovered a rat snake in her toilet the hard way, sustaining a bite that, while non-venomous, caused significant physical and psychological distress. Similarly, in Australia—a nation famous for its unique and often dangerous wildlife—a woman suffered a thigh bite from a carpet python that had taken up residence in her bathroom. In the Australian context, these events are often linked to extreme weather; during periods of intense heat or prolonged drought, snakes frequently seek out the moisture and shade found in residential bathrooms. The carpet python, though generally non-aggressive to humans unless provoked, can deliver a painful bite with its inward-curving teeth, designed to grip prey.