Caution! Your Digital Sign’s Been Hacked!

Come on, you’ve all thought about putting your electronics savvy and access to digital signage content to use for a little tomfoolery at one point or another, right?

Maybe sending some sort of inside joke across an arena’s LED ribbon signage? Perhaps stage a fake marriage proposal on the big scoreboard?

Although the pranking was done on a much smaller scale, some jokesters in Fort Mill, S.C.,...