I'll kill the double entendre right here. Basically I was sharing some files on the network with him and gave him the root password to my Mac (dumb). He made a mistake and dragged the my ~/Library folder somewhere random. That's the bit on the Mac that holds all the Keychain passwords, cookies and various settings for applications. Anyhow I fixed it, the only Application that freaked out was Firefox. Everything else was all "Oh no more passwords.. wanna make a new one? No? Ok!".

This is where I make the obligatory "try doing THAT on Windows" remark...