Who are your dream dinner party guests? It's a question often asked at, you guessed it, dinner parties! The choices aren't normally restricted so you can choose anyone alive or dead, it's a bit of a cliche but interesting (in good company), it tells you quite a lot about the person answering and what interests them. For example if the people chosen are all sports heros or perhaps if they are authority figures (like HRH) , famous authors or even famous scientists, some people go broad and some go niche, its something that's hard to predict, hence the amusement I suppose.
Personally I wouldn't choose anyone in the picture above, for me it would be more about the quality of the conversation and/or debate (and a decent plonk of course!) Maybe people like Bertrand Russell and Christopher Hitchens on philosophy, Newton and Maxwell on science, and for historical colour, Marcus Aurelius and Alexander TG, but of course this list changes on a regular basis, usually every time the question is raised!
One of the best (modern) jokes on this subject that I've seen recently is someone being asked this question in an interview, and his reply was a gem, he said, "Nigel Farage" followed by a pause and then the word "dead", a sign of the time perhaps.