What always goes up when it rains?

Why this works

This riddle plays on the dual meaning of "goes up." When it rains, people often open their umbrellas to shield themselves from the rain, which means the umbrella literally goes up. The clever twist lies in the expectation of a more complex answer, while the simplicity of the umbrella's function makes it the perfect solution. So, when you think of rain, the first thing that comes to mind is seeking protection, and that’s where the umbrella shines!