California Trolololols Manhattan
New York was trolled recently by a one Caltech Prank Club. As you can see above, the prank consisted of turning a sculpture into the beloved companion cube from Portal 1 and 2. It was most likely quite easy to do this since the sculpture being trolled was already a cube, called the Alamo.
The cube, which dates back to 1967 and was done by Tony Rosenthal, has also been turned into a Rubix cube before amongst other things.