Imagine an annoying sound ringing in your home every night at the exact same time for 13 years? Yes, it’s wacky, but it happened to one couple in Pittsburgh, Pennsylvania.

For the past 13 years, Sylvia and Jerry Lynn have heard a loud sound coming from the wall in their front room. The sound is always consistent and rings nightly for 10 minutes, from 7:50 p.m to 8 p.m.

You might think it would make them disturbed, but this couple takes it another way. Jerry says the sound is a conservation piece, while Sylvia has grown to be very fond of the repetitive sound that fills their home every evening.

It seems like the sound has become a part of their life, so they never had any reason for the sound to stop. Until one day, as one local air conditioning company heard about the interesting sound coming from the wall, they decided to fix the problem.

And unexpectedly, there was an alarm clock in the wall! Jerry said he thought the battery would die after two or three months, but the episode strikes him back, 13 years and the alarm clock is still working.

Sylvia and Jerry chose to still have the sound begin every night at 7:50 p.m.

Watch the video above to see how the alarm clock was discovered inside of Sylvia and Jerry’s wall – and how exactly it got there!

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