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The simple rule for "I" versus "me" is that the sentence has to make sense if you remove the other person mentioned in the sentence. For example, if you say, "Bob and I went to a movie," it would still make sense if you removed "Bob and" and said, "I went to a movie." If the sentence is "Please give the documents to Bob and me," you can remove "Bob and" and it still makes sense as "Please give the documents to me." You'll often hear smart people get this rule wrong, so don't be fooled by how many times you hear it incorrectly.

Theory Versus Hypothesis Nonscientists often use the word "theory" when they should say "hypothesis." Without getting too technical, a theory is a scientific explanation of reality that is so well tested that it is as good as a fact. The correct term for an unproven and untested explanation is "hypothesis." For example, I think it is possible that humans are the result of aliens seeding Earth with life that evolved over millions of years. I have no evidence for that idea, so it's merely a hypothesis. In conversations with friends I might call it a theory. If I blog about it, I'll play it safe and try to remember to call it a hypothesis. I've probably had more complaints about my inappropriate use of the word "theory" than any other thing I've done to anger the public, and that's a long list.

"Hopefully" Most people misuse the word "hopefully." It's bad grammar to say, "Hopefully, she will bring the dessert." "Hopefully" should be an adverb. Say instead, "We waited hopefully for dessert." In the latter case, "hopefully" is correctly modifying the verb "waited." In the first example, hopefully just sits there like the wrong word choice.