I saw 9 dolphins
You say this when you're too brain-dead to realize you're looking at a naked couple. It came from a silly drawing that made kids see dolphins instead of a couple having sex.
'I saw 9 dolphins' because I thought the dolphins were playing soccer.
'I saw 9 dolphins' and didn't know what my friend was talking about.
'I saw 9 dolphins' and thought the dolphins were doing yoga.