The family chose to put up a sign at the bottom of the ladder that reads: "Clark G is part of our Christmas display please do not call 911".
The family said they bought the dummy online and decked it out in a Chevy Chase mask and clothes like those the actor wore in the film.
This is the scene from National Lampoon's Christmas Vacation that the family was recreating with its decorations.
Neighbors frantically called 911 after seeing the Heerlein family's elaborate decorations that recreated a classic scene from the movie National Lampoon's Christmas Vacation where Clark Griswold dangles from the roof.
But the mannequin hung by Chris Heerlein was apparently a little too realistic, startling a passerby last week who panicked and tried to save the Griswold stand-in - and called 911, KVUE reported.
'Can you reach it?' Norwood asked. "And be like 'Save Clark!'" Heerlein's sister-in-law Leah Wheless said. They called 911, along with about a dozen others.
The security video then cuts to a police officer who came to the door to ask about the hanging mannequin.
'I was trying to get him down any way I can, ' Alfred said.
The family now has a sign attached to the bottom of the ladder saying the dummy is part of their holiday display and not to call emergency officials. Please don't call 911. The homeowners felt so bad about the incident they got in contact with the concerned passerby, a retired veteran identified only as "Alfred", and gave him a gift card as an apology.