These are fab, I've been laughing out loud! I love the back to front ones especially, we have lots of "optocus" and the like. My six year old goddaughter still says "basketti" instead of "spaghetti"!
incognito - the your/my thing is totally logical! D can't get his head round that at all, he always says "your" when he means his.
The foof story isn't really long, just silly - whenever we changed a pooey nappy we would always make him laugh by saying "OOF!" with associated pulling faces and so on. Then when he started talking, he started with "oofy oofy oofy" which of course morphed into "foofy" from us. He doesn't even know the word poo now, he will just announce that "Daniel's being foofy". Everyone in our family uses it now!
I wanted to go out and change the world but I couldn't find a babysitter.