The campaign is a modified Faerun with airships setting (I got the Bastion Press book, and love it), so the 3rd level party is currently running through the woods trying to escape an airship that's hunting them (they were onboard, until the party rogue, during a violent storm, stole the chaos diamond that the captain was keeping in his cabin). The party is almost out of the woods, and comes to a large clearing. As the party moves through the clearing, the awakened eagle in the party makes a passive spot check, and notices the large, fast moving object coming up overhead.
The party: Ohhhhhhh Sh!!!!!!!!t
Me (dm): Ok, as the airship quickly descends, you can see the hidden fire missle turrets on the bottom coming into view. You can hear the shouted words "Fire" as you stand transfixed
The party rogue: Didn't I make a disable device check on those launchers? Too booby trap them?
Me: Oh... Yeah. Ummmmm, everyone make reflex checks. To avoid the burning wreckage and all that.