Le Cop on Le Rocks

Inspector Clouseau is wrongly convicted of a crime committed by his look-alike. He is put into prison where he tries to break out so that he can find his look-alike and clear his own name, but all his escape attempts fail, and each time, a no-nonsense warden assigns additional years of imprisonment to the hapless Clouseau. Finally, Clouseau learns he will be granted freedom if he can pound one rock into pebbles-and it's the Rock of Gibraltar! (imdb)