Probably the most gratuitous one that springs to mind is from the Dirty Pair -- Project Eden movie.
The DP are investigating a recent monster attack. While gathering information an ore refining plant falls on them (not their fault) and gets them dirty. After arriving at the scene they poke around for about thirty seconds before finding the bath and settling in. Then to top it off, they end up losing their uniforms, such as they are, for pretty much the entire rest of the movie.
Of course, the movie gets many, many points for the way they introduce the chief villain, Professor Wattsman.
The DP are investigating a recent monster attack. While gathering information an ore refining plant falls on them (not their fault) and gets them dirty. After arriving at the scene they poke around for about thirty seconds before finding the bath and settling in. Then to top it off, they end up losing their uniforms, such as they are, for pretty much the entire rest of the movie.
Of course, the movie gets many, many points for the way they introduce the chief villain, Professor Wattsman.