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
Eid Mubarak SMS >> Dushmani lakh sahe khatam na kejeye rishta,
Dil mile na mile aaj eid hai hath milate raheye… Added On: 19/Mar/2009 by admin | Send
>> The happiest thoughts and wishes in this greeting are here.
And hopefully you’ll understand the depth of feelings.
That this eid sms is sent especially for you. Added On: 19/Mar/2009 by admin | Send
>> Momin ka
her wo din
Eid ka din hay
jis din wo
koi gunah na kare. Added On: 19/Mar/2009 by admin | Send