"Christmas Vacation" prank: Highway sign changed to "Clark Griswold"

At least one "Christmas Vacation" fan was driving on New Jersey's Garden State Parkway Thursday.

A prankster (or pranksters) changed a sign for the highway's exit for Clark and Westfield to read "Clark Griswold" -- the name of the father character played by Chevy Chase in the 1989 National Lampoon Christmas cult classic.

State Police spokesman Sgt. Gregory Williams confirms photos of the sign posted on social media are real.

"We are aware it's floating around the Internet," Williams said, according to NJ.com.

He added that the taped-on Griswold sign at the highway's exit 135 later was removed by the Turnpike Authority.