Paramount released Ferris Bueller's Day Off on June 11, 1986. A little known fact: Ben Stein's monotonous lecture about the Smoot-Hawley Tariff Act and supply-side economics was not in the script; he had been amusing the cast with mock lecturing, and they liked it so much that John Hughes had him improvise a lecture for the camera.
The movie wears surprisingly well, partly because the weaker humor isn't front and center. I find I have much more sympathy with Mr. Rooney these days than I did in decades ago; but it is as true as ever that "Life moves pretty fast; if you don't stop and look around once in a while, you could miss it!"
