Perfect genre book for people who don't read sf

SF Signal has a panel session on it, with many recommendation.

I, with my limited genre experience, would recommend Eric Frank Russell's "Wasp" or "The Best of Henry Kuttner", depending on whether the target preferred long or short fiction. Both are light fun reads, clearly science fiction, & very unlikely to put the uninitiated off genre.

What would you choose?

Related: "best of" lists.