I think a wonderful, amazing hack would be for someone to hack the JumboTron & various displays at a baseball park during the 7th-inning rendition of ‘God Bless America’.
If you were a patriotic American hacker, perhaps show more ‘truthful’ images to the people.
If you were otherwise inclined, well, I hope such a massively public forum would be used for a worthy cause, rather than kicks.