No joke.
No joke, but I may need to come up with some connection to the Finnish health department.
No joke, I was just messing around with letters.
No joke. It is probably possible to form jetkat for meanings of 'to sleep' that take a cognate object, or for expressions like "sleep off", but I'm not ready to put that into the official lexicon yet.
Joke: Turun Palloseura (TPS)
Joke: TRomPe-l'œil (the <m> is just there to mark nasalization; I can leave it out for the joke).
Joke: right/write (you write a TeXT)