ANN ARBOR, Mich., Sept. 1 (AP) — Dexter Jackson sprinted through the secondary early in the first quarter, taunting nearly 110,000 Michigan fans by putting a finger over his lips en route to the end zone. Nearly three hours later, he got the desired result and the Big House was silent: Appalachian State 34, No. 5 Michigan 32.

Julian Rauch kicked a 24-yard field goal with 26 seconds left to put the Mountaineers ahead of the Wolverines and Corey Lynch blocked a field goal in the final seconds to seal a jaw-dropping upset that may have no equal.

“I told them to be quiet — we’re going to be out here all day,” Jackson said, explaining the gesture he used after scoring a 68-yard touchdown. “We’re playmakers. They were talking trash on us, now we’ve gotten them back.

“It was David versus Goliath.”

Mike Hart, Chad Henne and Jake Long, Michigan’s threesome of offensive stars who put off the N.F.L. and returned for their senior season to chase a national title, never saw this coming.