This is no April Fool's joke! (Though this code is for Wed 4/1 but somehow got posted as Monday).
Haven't tried out the free movie deal at Redbox yet? Hurry! The weekly free movies are about to end. (this might be the last one).
The Redbox code for today (good through midnight) is MMM401
The rental is good for 24 hours. Find a Redbox near you (in the Bay Area, they're in lots of Lucky's stores along with some others).