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This is why you're not supposed to touch when you visit a museum... 

The video above from the National Watch and Clock Museum in Pennsylvania shows a curious visitor tinkering with a priceless clock before it falls.

The painful-to-watch moment was captured Tuesday on surveillance video, as the intricate clock falls and breaks into pieces.

The museum staff did not ask the man for his name and will not press charges for the damage. 

But they said they posted the footage online to remind people to respect the "hands-off" rule in a museum.

"We have more problems with adults than we do with children," museum director Noel Poirier told Lancaster Online. "Adults seem to feel slightly more entitled to touch things."

Poirier said it appeared that the man was trying to get the clock to work, pawing at it numerous times before the disastrous result.

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