Yeah, it kinda blue blew my mind that there are more examples of autoantonyms than I thought, and that some really common words/phrases are autoantonyms.
Also, no mention of homophones is really complete without this Veggietales song:
I thought this was pretty interesting. In essence, there's a particular kind of tree that provides food and shelter for lemon ants, so those lemon ants kill other species of plants with formic acid to help their tree buddies grow without much competition.