You use who for a subject and whom for an object. Matthew Inman explains at length using delightfully horrifying examples. You can read them all at the link.
I like Mr. Jenkins. He's a man after my own heart. Whom could object to his actions?
Still not crystal clear. I remember it this way: "To whom am I addressing/speaking to? as opposed to "Who threw that snow ball?"
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The thing about The Oatmeal is that you don't have to understand it, or even get the point, to enjoy the goofiness.
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If you can answer "him" or "her" to whatever your topic is, the correct pronoun is "whom". For example, "To whom did you give the red stapler at the holiday party?" "I gave it to HIM." If you can use "he" or "she", then you're looking at a "who" situation. For example, "Who received the red toaster in the holiday grab bag event?" "SHE did." Thus, the "M"'s have it!
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