We don't know if we'd ever believe this without the evidence to back it up.
In the big scheme of things, whales don't face too many dangers in the ocean. But one recent study turned up proof that two long-finned pilot whales suffered an unfortunate demise due to an odd reason: fish getting stuck in their blowholes.
It's just another one of those cases that prove the power of nature is too tough to imagine. As long as studies like these are conducted, we can sit back and wait for the next cool discovery.