There’s a saying, “The weakness of an enemy forms part of our own strength.” Apparently, Capital One Financial Corp. is extremely familiar with that adage.

Below is a newly released YouTube clip from Bank of America Corp. featuring the bank’s new Windows 8 mobile app. And Cap One, seizing on the opportunity, has purchased ads for its Venture card that run before the Bank of America clip. (Those ads might not show when you view the video here on Bank Innovation, but just trust us on this one.)

If this isn’t a war of ad buys, we don’t know what is. The fact that YouTube allows for Capital One to one-up BofA by easily buying the ad that runs before the BofA ad just makes the war that much more brutal. Look, we’ve seen these types of strange bedfellows on YouTube before, but today, in 2012, how could BofA allow for this? Let’s just hope the CMO at BofA doesn’t see the video and ad — or this post, for that matter.

UPDATE, 1:18 p.m. ET

The video we originally posted was removed from YouTube when it “terminated” the account “due to multiple, third-party notifications of copyright infringement.” This only highlights the Wild, Wild West of it all (ht to The Financial Brand for the spot). We’ve reposted the video below from Bank of America’s official feed, so you can see the promo, albeit without the Capital One Venture Card ad proceeding it. And the games continue …