A Meta-Joke
Three scientists of different disciplines encounter a perfectly normal situation. The first two say something appropriate to their respective fields. The third one says something entirely useless and unexpected for the situation yet humerous and bizarrely appropriate for his occupation.
And one on nationalities...
Three people of different nationalities walk into a room. The first two say something witty and intelligent, while the third insults all of his countrymen by responding like an idiot.
