I do have Laughing Space, but I had read it much earlier. My late Dad frequented many second hand bookstores, and got a lot of yellowing paperback anthologies, but I'm dashed if I could tell you which one it was in. Unless I'm completely misremembering.
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Could it have been this 1982 collection? http://www.isfdb.org/cgi-bin/pl.cgi?328711
That's where I encountered it.
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or
http://www.isfdb.org/wiki/images/3/3b/THTHRDGLXR1960.jpg
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