NEW YORK (AdAge.com) -- Sometimes it's obvious why a video hits the Ad Age Viral Video Chart. Sometimes, well, it's not. Put the latest two newcomers from La Senza and Google in the former category.

No. 10 on the chart this week is "Cup Size Chorus" from La Senza, and for any of you who'd like a comparative look at cup sizes, as well as comparative notes A through G, then this is a video for you. The campaign generated 578,418 views last week, the majority coming through referrals from the Cup Size Choir website, according to Visible Measures. La Senza, owned by Limited Brands, is a corporate sibling but competitor of Victoria's Secret.

At No. 9, we have another in a string of imaginative videos demonstrating various Google products. Google has devoted an entire site to these demos, Demo Slam, and the video that hit the chart this week shows off the capabilities of Google Googles. It's pretty cool stuff, but as we've pointed out in the past, Google can pretty much make anything hit the chart with the distribution power of YouTube and paid placements through the Google Content Network.

Otherwise, the chart is full of familiar campaigns. Evian joined for a record 70th week; Australia's Transport Accident Commission is No. 1, helped by coverage in automotive blogs last week; and Axe, Hyundai, DC Shoes, Blendtec, Nike and Old Spice are all back on the chart.