Original Tip #2 - Never take a bath or shower with an MSDC (maniac/ spirit/ demon/ creature) in the house.

You could argue that these characters wouldn't bathe or shower if they knew the boogey-man were lurking about, but can't these people hear the creepy music playing in the background? I mean, don't they watch horror movies?

More seriously, there is an obvious titillation factor - scantily clad flesh, I mean - that draws us to these scenes, and when combined with the artistic/psychological layer of being unclothed (defenseless) it can make for a compelling scene on multiple levels, since we seem to bear a sick dread/fascination for the mutilation of naked, screaming eye-candy.