If you still have a bit of middle school humor in you like I do, it'll make you chuckle to hear that a group of people changed the HOLLYWOOD sign to say HOLLYBOOB for a night.
Because they did not damage the sign [they put a tarp over the W and a dash behind/in the D], they're only facing misdemeanor trespassing charges. Not bad a good prank, if we're speaking what's on our minds.
People have changed the letters before, of course. Here's a look at some of them: