The last time I went to the park, a squirrel crawled up my leg. That was fun, but nowhere near as noteworthy as the display put on by the well-endowed female jogger in this ZippearZ earbuds commercial. The ad is subtly titled “Rhythm & Boobs,” and that pretty much describes the action. The auto-jiggling inside that gal’s top is something to behold. The ad promises “They won’t fall out.” I’ve watched the spot 20 times, and I’m here to report that they haven’t. So far.