X-Box
Most stupid exchange in the film:
Affleck (yelling upstairs to son) Why don't you play your X-Box?
Mother - We got rid of the X-Box a few weeks ago. We couldn't afford it.
Huh???
For those unfamiliar with video game consoles: You purchase the console and then you own it. Even if you don't have a lot of games (which isn't usually the case when you can afford a console) you are VERY unlikely to ever be in a situation where you can no longer afford a gaming console which you own.
Both my girlfriend and I stared at the TV when these lines were uttered.
Mind-numbingly dumb.
Bad films are a crime against humanity.