All over the web one can find statements to the effect that:
"One must be able to say at all times--instead of points, straight lines, and planes--tables, chairs, and beer mugs"
There are many variations, some in quotes (lots of variations here) and some not, all paraphrases of the same thing.
But I can't seem to find any kind of original source on-line. I can't seem to find anything like it in Die Grundlagen der Geometrie (suitably using German words).
Does anyone know where this first occurred in Hilbert's writings (if at all!)? And if made up, who did it?


Funny enough, this is not the first time that I've seen this question come up. It is reportedly from a conversation that Hilbert had with Blumenthal at a train station in Berlin, on his way back to Königsberg.
Grattan-Guiness included this in his book The Search for Mathematical Roots on page 208. It is also supposedly in Blumenthal's Lebensgeschichte, which has several bits on Hilbert, on pages 402-403 (published in 1935 by Blumenthal himself).
A quick search also revealed That there is some sort of reference in the collection of Hilbert's Papers Gesammelte Abhandlungen, in 3 volumes, published in 1934. I don't know who edited this collection, but most every source I have heard believes that this came from a conversation with Blumenthal in Berlin. Or that Blumenthal made it up because it was convenient. One or the other.
Edit: (T.B.) The relevant section 4.7.2 on pages 208–209 from Grattan-Guiness's book (taken from Google Books):