This joke is from the collection
of PJs that I get mostly by forwarded mails or word
of mouth. Many of the PJs have Indian specific orientation,
and some of them are in Hindi.
Due to the nature of the PJ
there is always a context in which it can be enjoyed.
For the rest of us who are not in the right context
there is a translation and context section below
the joke. Who have missed the fun part do read that
section for additional information.