Content so popular is released that the servers it's hosted on can't handle the resulting traffic.
Do We Have This One?? Is This Tropable?? Needs a Better Description. Up for Grabs if I forget about this. Popularity is obviously subjective, and very difficult to measure. But there are ways. When the latest update to an online something-or-other is released, sometimes so many people crowd in to view it that the website crashes. The fact that this even happened is a testament to how popular whatever was just released was. That, ladies and gentlemen, is a Bandwidth Breaker: an update or issue so awesome it's directly responsible for crashing the host website. This also applies to other forms of media; for example, a product selling out so quickly it can't be kept on the shelves. Depending on how you look at it, can be a subtrope of Gone Horribly Right.