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By Karissa Giuliano

Some iPhone users are scratching their heads over an unusual Siri phenomenon that takes place when commanding the technological assistant to charge their phone.

Saying the words "charge my phone 100 percent" will prompt their devices to give them a five-second window before automatically calling emergency services, CNBC has discovered.

Read More from CNBC: 13 tricks you didn't know you could do with your iPhone

While this unusual function could lead to many mistaken emergency phone calls, it also has the potential to be a discreet method of calling the police in the event of a home invasion or kidnapping.

Many iPhone users have taken to social media after coming across this function:

It is unclear whether this feature was introduced intentionally by Apple or is simply a software glitch. Apple did not immediately reply to a request for comment.

The strange feature, first reported by The Verge, appears to works on both iOS 8 and iOS 9, according to multiple experiments conducted by CNBC.

UPDATED July 17: Apple appears to have fixed the glitch.