This one seems more like a simple prank or just bad data getting submitted somewhere. On Yahoo if you type in a business address, it will show the name of the business.

So what happens if you type in Google’s address?

Dangers of trusting your own local, unvetted data over vetted sources. In this case, Yahoo! Maps identified the Googleplex as a fish store, because someone -- likely a Googler -- opened a Yahoo! Shop with that address. And while therefore that is a valid identifier for the address, it is unlikely to be the primary.

Matt Cutts: Gadgets, Google, and SEO » More Yahoo strangeness