The answer to 'bathtub overflowing' is that a clogged drain or a blockage in the plumbing system is the most common cause. This can lead to water backing up and overflowing the bathtub. Symptoms may include slow draining water, gurgling sounds, or water pooling around the tub.
In many cases, the issue can be resolved with a simple DIY fix, such as using a plunger or a drain snake to clear the blockage. However, if the problem persists or the clog is difficult to remove, it's best to call a professional plumber. They have the tools and expertise to thoroughly inspect the plumbing system and identify the root cause of the issue.