Hereafter is the famous Microsoft ads featuring Jerry Seinfeld and Bill Gates, aiming to promote Windows Vista:
In summary, Seinfeld explain to Gates that one needs some time to feel comfortable in brand news shoes kind of metaphor to explain that Vista users should try harder to like this new OS before dumping it and moving backwards to XP.
When browsing the web, this ads seems to be massively criticized, and several jokes are already circulating if Microsoft was expecting the web to react about this ads, it is a success, however, not sure it is the way it as intended to be
[translation by Linathael]