There used to be a rumor that if you call 999, the UK version of 911, you can charge your phone. It's a myth that's often had to be debunked by local police forces all over England. Apparently it all started with Blackberry and what turned out to be a flaw in the programming that developers intended to be a helpful way to conserve battery power for emergencies only.
Youtube host Tom Scott travels all the way to the Blackberry headquarters in Slough, England to set the record straight.
As a sidenote, for those of us who are not UK residents, he also takes a moment in the comments to explain why Slough is such a punchline in the video.