I think that Power Rangers thing is just dumb, for two reasons. One, the word "Morphin" is spelled out in the frickin' title of the show! It's obviously not morphine. "But what if the kid is too young to read?" you might ask. Find me a kid who hasn't gained the skills to read yet knows what morphine is, and I will buy him a car!
EDIT: Third reason. What's so bad about morphine anyway? It's a legitimate drug. I don't see how knowing of its existence is supposed to be damaging to kids.