Oh yeah, it happened.  Actually...bombS - plural.  And a missle, too.

According to Click On Detroit, a mechanical failure caused a military plane flying over the northern part of Michigan's lower peninsula to drop six training bombs and a training missile.

Fortunately, there were no catastrophic explosions -- the gear was apparently designed to basically be props, though the bombs can release smoke that help pilots find there they landed.

The incident occurred October 25th in Oscoda County, according to the report, and no one was injured.  The gear was found in what is described as "a remote wooded area near Luzerne."

The plane had taken off from Selfridge Air National Guard Base near Detroit and was headed to Camp Grayling.