I was using it rather than being forced to buy more reusable bags. I needed it, I just forgot to scan it with my groceries.

I never intend to steal anything from walmart but it happens unintentionally with some regularity...and when I get home and realize I've stolen that 20lb bag of cat food or I have seven cucumbers instead of five I always sit and think "if only there'd been someone there to check me out we could have avoided this travesty."