Who Spray Painted 'Prom?' on a Rock in Cherry Canyon?

It may have been a prom prank, but La Cañada resident Anne Karayan isn't laughing. 

The La Cañada Valley Sun reported Thursday that the avid hiker took a photo on the Owl Trail of what appears to be a prom invitation: the word "Prom'', followed by a question mark, spray painted in black letters on a rock formation in Cherry Canyon. You may view the photo here. 

In an email to the newspaper, Karayan wrote, "“Every morning I walk along the trail with my dog. It's beautiful under the oaks, an escape from the city into a natural paradise. To find graffiti on the boulders ruins that sweet, innocent beauty,” the article states. 

Karayan opined that a local teen-ager vandalized the rock in an attempt to ask someone to prom, the article states. 

Two La Cañada schools hold their proms on Saturday night: , at L.A. Live, and at the Petersen Automotive Museum.