2 + 2 = 5
a track from radioheads "hail to the thief" amazon.com have reviewed the album they said:

"Hail to the Thief borrows equally from each. Its title implies that this will be a collection filled with songs of anger and dissent, but Radiohead no longer howl at the moon like they did on 1995's The Bends. Instead, they use eloquent metaphors and complicated arrangements to express the uncertainty, fear and anger arising from the 2000 U.S. presidential election and a post-9/11 world. There’s no doubt about where Thom Yorke and company stand; the prog-rock break on "2 + 2 = 5" and Yorke's terror at the thought of being "put in a dock" make that immediately clear"

it can be used to express strange things that have happend , and or lack any sence
"did you see how that guy got an extra can of drink from that machine?"

"yes it was very 2+2=5"