I just tried and they still work (with the free ChatGPT). Jokes about Mussolini saying his traffic reforms were as successful as the invasion of Ethiopia and what not. Stalin saying that the other car drivers were "probably discussing the merits of socialism instead of driving" (a good joke!). Göring saying "at least in the Third Reich traffic worked" etc. Some sort of Monty Python tone. But you can't begin with Hitler. Or it will refuse the others. You need to make a new chat after naming Hitler.