This is a great example of an unexpected company using humor in its marketing: Bodyform, a company that makes liners for women on their periods. Some dude wrote a really snarky post on the company's facebook wall complaining that he'd been lied to by their ads. His girlfriend was never as active or happy on her period as they claimed. There was no blue water! The company responded to a facebook post with this youtube video which is brilliant.

Got any other examples of companies embracing humor in their customer (or prospective-customer) communications, marketing, ads, etc?

That is super great! Humor humanizes. Can't get much more human than saying "the blood coursing from our uteri like a crimson landslide." Also love that it stems from Facebook. Sometimes you don't need to pressure yourself into conjuring up a wholly invented jumping off point, there is an entire pool of resources within your Facebook wall and Twitter feed.

Nice. Related but not answering your question, there was a funny riff in a recent Nerdist about the Diva Cup: nerdist.com. That concludes my database of period-related humor.

Yeah, what struck me about the video is that they were creating great content for just one dude, as Old Spice has done. When it comes to creating advocates that will tell your story, personal attention works.