I was there at the inception of this PJ, although I don't remember which one of the many idiots I know of actually thought of it. You must have already heard of it. It has taken the joke world by storm.
In a classroom Sir asks a question. "ek baar, ek ladke ki plate mein, paav (bread) ke neeche "Jannat" likha tha. To uske Sir ka naam kya hoga?"
Answer - "Ishq di chaav" !
Jinkey Sir ho "Ishq di Chaav",
Paav ke neeche "Jannat" hogi.