As a kid, a buddy and I swapped a bunch of “For Sale” sings in front of houses as a Halloween prank. The one we put in front of the high school showed up in the local newspaper ;-)
I think I have a better one. My old boss' son put an advertisement in the newspaper selling his high school as commercial real estate. He went so far as to list the approximate square footage, phone lines, etc... . He gave the school office number as the point of contact. Surprisingly, he only got: in school detention for a month, had to pay for a newspaper retraction and the ultimate punishment- the school call forwarded all inquiries to his personal cell phone. My boss visited the school a year later (younger child went to the same school) and everyone she met (including the principal) mentioned how hilarious the prank was.