Cory thinks his Mom is cheating on his Dad after he finds a slinky dress, stilletos, and a note saying to meet at this high- school hangout. OH Cory! You silly goose, everyone knows old people crash those things! Anyway turns out that she and Alan are both sneaking out.....together. SNAP!
Also, the message that I was referring to was Feeny's "Math Problem" or so he said. I can't remember exactly what the problem was. BUt it turns out the answer was "there isn't one" cause sometimes there just isn't an answer to things. I like that.
Anyway Cory realizes his Mom is doing nothing wrong since he was once in love with Amy.