Right, a question I came up with while reading over the Ranma 
Error Drinking Game stuff:
"HEY, DIDN'T THEY GET RID OF THAT?":
If the Dragon's Whisker still makes Ranma's hair grow                 1 drink
	Right.  Does that mean that the hair _doesn't_ keep his hair from 
growing, or something.  I've never actually read the storyline, but I 
thought that, unless he tied his hair back with the whisker, his hair 
grew like crazy.

It wore off at the end of the story.