Actually Google is very high on humor, which shows to me that they are not just commercial cold-blooded types - you probably know that they have one of the world's highest concentration of PhDs in a commercial organisation. The simple web page, on which they often reflect global events through fun modifications of their logo (right now, every day is a new Olympic event) I think shows a good attitude. Can you imagine a Microsoft or Sun playing with the logo on their main site?
There are many other examples of irony (even anti-Bush administration jokes, and anti-MS) they make through Easter eggs planted in the I'm Feeling Lucky option - but I don't think this is the forum for exchanging all of them. In fact, since these jokes are not taken down, it is clear the Google management tacitly approves, so they aren't really classic Easter eggs, though the jokes themselves are classic.
Against this, I am afraid I find many commercial Linux distro companies totally short on humor of any kind. If anyone would care to correct me, most welcome.