Returned a bag of chips to the store that hadn't been sealed properly. In the past, I would've skipped it, since it was less than $2. But I was going past the store anyway, so I ran in and exchanged them for a properly sealed bag and didn't buy anything else!
My SO isn't Mustachian, but I'm slowly working on him. Convinced him to only eat out once this weekend, and it was to a cheap sushi place where lunch was less than $8. He got creative with leftovers for dinner, and it was delicious. He wanted to learn to bake bread, so we did that as a fun activity instead of going out. Another activity was going to the local bulk grocery store and pricing the bin items vs. already packaged.
At the big box store, I had my coupons and Shopkick digital gift card, and managed to save $9 on a $40 order of all HBA items. He joked that I was making money on this transaction, and called me the Coupon Queen to the lady behind us. We're getting there!
He suggested the bookstore, I countered with the public library. We had a great time and got a load of books.
I made it a point to praise his leftover cooking creativity, and get excited about baking bread. We had a lot of fun doing things around the house working on projects he'd considered hiring out. Overall, there were several frugal wins!