Random Thoughts on the English Language #19: Resigns vs. Re-signs

Saw this headline today, "New Mexico coach Long resigns after 4-8 season", and at first was thinking that he had re-signed -- signed a new contract. But after a second glance, I'm sure that it means that he resigned -- quit, and actually reading the article confirmed that. I just thought it was interesting that those two words are so close and have such opposite meanings.