A conscientious neighbour has raised the alarm after she finally had enough of a creepy silhouette that appeared in a nearby window.

The shape of a man appeared in Tennessee teenager Kellie Burkhart's window, and it was freaking out her neighbour's four-year-old child.

"I'm tired of being scared of whatever is in your kids creepy window," the neighbour wrote to Kellie's dad, Joe, on Facebook.

Kellie thought it was hilarious and immediately shared the truth on Twitter.

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Turns out, she's a big - nay, huge - fan of the TV show Supernatural, news.com.au reported.

Whoops! Supernatural fan Kellie Burkhart revealed on Twitter that she has been scaring her neighbor with her life-size cardboard cutout of Jensen Ackles, who plays Dean on the series. Photo / Twitter
Whoops! Supernatural fan Kellie Burkhart revealed on Twitter that she has been scaring her neighbor with her life-size cardboard cutout of Jensen Ackles, who plays Dean on the series. Photo / Twitter

So much so she actually has a life-size cardboard cut out of the show's lead actor, Jenson Ackles, in her bedroom.

She told Buzzfeed she hasn't moved it, but she is being more considerate.

"It is still in there, but for the sake of the neighbours I closed the blinds."