To people living in the warmer parts of the States, the idea of finding a little reptile friend crawling around your house isn't exactly uncommon.
Florida is the most infamous for this phenomenon, thanks to the number of alligators that live in the Everglades and find their way into civilization. The cold-blooded creatures like seeking out places to keep warm, and are known to crawl into heated water pipes and the like, where they end up causing issues and almost definitely spooking the neighbors.
Even when dealing with something nowhere near as scary as gators, it's still not an uncommon thing to see little geckos, bearded dragons, and other scaly critters roaming around in warmer climates. Most of these little guys are harmless, and are really just looking for a place to hide out during bad weather.
Of course, this can lead to some unwelcome surprises for the people who these reptiles decide to shack up with, and most recently, a Riverside, CA family got one of the biggest shocks of all when they discovered a giant monitor lizard in their backyard...