going back for the dog 

A movie cliché in which half the cast is killed because one of the characters, in a moment of imminent disaster, went back to save their dog, purse, sentimental trinket, or other such non-essential item. Often used by movie makers to ramp up the tension at crucial moments, but usually it ends up just looking idiotic.

"Look at her. There's a 1000 ft wave heading towards them at 700 miles per hour and she's going back for the dog."

"Okay, the frickin' world's about to end and these idiots are running around with suitcases full of their belongings. Talk about going back for the dog."

going back for the dog by Kevnar January 27, 2007