[rubypay]

The instant results seem to be served from memory rather than an actual search being performed. For example, try searching for:

zqqx

and after the 'x' is typed, no instant results appear. However, Pressing 'enter' to submit your search will show you the full results.

A new Google game: what's the shortest non-blacklisted key sequence that returns 0 instant results.

[ugh]

It looks like zqqx is (for whatever reason) one of the words for which instant search is disabled. Try the four letter word starting with f, you will see exactly the same thing.