My downfall is grocery shopping too...even when I have food in the pantry I am like "we have nothing to eatttt"...which is crap! I haven't joined the pantry challenge but I lurk which has helped a lot!
Another thing is thoughtless, impulse buying arghhhhhhhhh I am so bad at that. For instance, I will go into whatever store with a list and all, but I am always picking up a few other things we "need"...and trick myself into the fact that they are only a couple bucks, but when you are buying 10 items at "a couple bucks"...it adds up!
We are getting better though...we used to be in the grocery store 2, 3 times a week for "a few things", spending like $100 for 2 people...but now it has become a challenge for me to see how long we can go without going to the grocery store...we got the billdown to $85 last week and I am NOT stepping foot in the store until the cabinets echo lol
I am pretty good though for the most part but there is always room for improvement!
My hubby always says "it's not what you make, it's what you keep" and that is true....it seems like the more money people make, the more they spend and we are guilty of that too...I remember when we first moved in together almost 7 years ago, we were P O O R...I mean, $20 for the whole week for groceries kind of thing, and we survived and were creative....okay, I won't go that far again, but for 2 people, I think about $50-75 a week, even with healthy mostly organic food shouldn't be a stretch if we are creative ya know?
Anyway, those are my challenges! We are pretty frugal in almost every other area....