It’s only fitting that Jerry Seinfeld’s first Microsoft ad is — well, about nothing. The 90-second spot, which debuted during Thursday night’s NFL game, shows Seinfeld and Microsoft Chairman Bill Gates meeting in a shopping mall shoe store. Seinfeld casually saunters in, munching on a churro, and gets into a conversation with Gates about shoe size and finding the proper fit. Oh yeah, and also about the advantages of showering with your clothes on. The blogosphere’s already buzzing with criticism and calls of failure for the heavily hyped ad.