If you are looking for a RSS feed for your site which will supply jokes, you can simply use the feeder available.
Random Jokes Feeder link: http://freesms.parijat.biz/jokefeed.php
You can use a RSS reader to feed this information to your site. A simple use is being done on Funtelya website
Boy Vs Girls >> Jo larkion ko kehty hain baji unki nahe hoti hy shadi
Jo boys rehty hain larkion k pas wohi hotay hain firstclas
Jo boys ko kehti hain bahi
Hoti hain wo harjaie