Hello,
Have you ever been to Japan and tried Japanese bath?
If yes, you probably have had a trouble in taking a bath.
Taking a shower, washing your body in the bathtub and unplug when you finish.
This is foreign style you know.
As you come to Japan, you may have done with the same way as you were home.

But this is the wrong way and the next person ,especially Japanese will be surprised.
To prevent such a situation, you must know the right way following.

1: Wash your body before getting  into the bathtub.
2: Do not take towels into the tub.
3: Soak shoulder - deep in the bath.
4: Do not unplug as you finish.

You should try this way next time and you'll never be in trouble!