ghoti

ghoti is what you write down to confuse someone. Pronounced 'fish', it utilises the 'gh' from 'cough', the 'o' from 'women' and the 'ti' from 'action' to become a confusing little bugger. If you are writing to a posh person, be sure to start a conversation about fish, and say 'ghoti' several times. It means fish, too.