We’ve all done it. We’ve gone to the local department store with a list and vowed to only pick up what’s on it. We were determined and vigilant at the onset of our trip.

However, things always seem to change once those automated sliding doors open. Once you’re strolling down the aisles, with all those perfectly placed items you never realized you needed, everything goes out of the window.

Turns out this is marketing and design at its finest. Everything is carefully thought out. From those huge shopping carts that never seem to be filled. Or those free samples that seem like a great idea until you realize you grabbed three boxes of pigs in blankets.

In the video above, you’ll find some of the ingenious ways that Costco secretly gets you to spend more money than you planned. So don’t feel bad when you hand over your extra-long receipt when leaving the store. You didn’t stand a chance.