Since the concept Bay of Pigs was heard constantly in the media back then, some stand-up comic of er, um, let's say Albanian background put two and two together and presto: another "witty" (!?) Pollack joke
I suppose, its not a very funny joke anyways?
There are jokes for every nationality in the world, some are funny, some are truly tasteless, yet they still are just jokes. I dont take them personally:)
I must of heard all of them at so point in time, Polish jokes are relativity conservative compare to the racist Black jokes I hear often.