All the comedians are English
All the cooks are French
All the lovers are Italian
All the service is Swiss
and all the mechanics are German
All the comedians are German
All the cooks are English
All the lovers are Swiss
All the service is French
and all the mechanics are Italian
Dreadfully unfair, of course. I like English cooking, or some of it. Roast beef, Shepherd's Pie, Cornish Pasties. Hearty stuff. As for Italian mechanics, someone there must work on the Lamborghinis and Ferraris. I wouldn't know about the rest. We were only in Switzerland for a long layover and went into Zurich, but the service we had at the restaurant was rude, so I'm not buying that their service is universally excellent. And I don't know the basis for picking on its lovers. I think five entries each is the proper balance for the joke, so the Swiss got thrown in because they couldn't think of anything for Scandinavians or Dutch or whatever. Graham Chapman of Monty Python might agree about the German comedians, though.
I asked a Romanian friend if there was a way to construct something similar involving Romanians and Hungarians and he said it must be easy - then laughed because after five minutes of trying he couldn't think of anything that worked.