The old jokes are the best. But sometimes they date, especially if they involve slang, politics, current events, etc. But often the core of the joke can be resurrected.
And now an offensive Irish joke…
And finally a generally offensive joke 
Come, add more old favorites. The guidelines: update or change a joke, preferably an old one, but changing nationalities to more appropriate ones, etc, is good too; it doesn’t have to be political, but I expect most of them will be. Go to it.