This happened on a flight maybe 8 months ago or so out of MCI, it wash;t my flight thankfully. I was headed to IAH and the ORD flight next door was boarding and then all of the sudden de-planed. I was curious what happened, so I asked a passenger who I was sitting next to earlier and she said a passenger shoved their bag into the bin and it broke. I guess the passenger was shoving so hard that the bin came off its mounts, and the flight canceled. That is an ouch.