If you take your own reusable bag to the store, most likely you're a woman. Guys prefer the single-use plastic bags, apparently, for one strange reason.
If you've never considered hoarding, this may change your mind. The price of olive oil and cheese could be going up soon by quite a bit, so you may want to stock up now.
Every time I go to the grocery store I think I'll only spend fifty bucks, and the next thing I know the total flirting with $150 and it's not from lobster and caviar. It's just average stuff! What common things jack up the grocery bill the most?