When our youngest son Chris was 5 he spent almost everyday of the summer swimming in our next door neighbor's pool with their little girl.
This one hot day, he was standing by the poolside looking longingly at his friend swimming in her pool. My dear friend (the funniest person I know), this little girl's mother comes outside and stands next to him and says, "Chris- why aren't you swimming in the pool?
He says, "I can't."
"Why Can't you?"
He glumly says, "Because I have wrongitis."
LOL! He had bronchitis. :)