Airman Timothy Johnson (at left) and Lieutenant Alan Proctor update the "ouija board" after a launch from the USS Dwight D. Eisenhower. MCSN David Danals, USN Guys gathered around a table ...

Visitors to a Portland park were dumbfounded when they saw bizarre signs saying Ouija boards were banned from the area - but officials have confirmed the posters are nothing more than an odd prank.