TIFU by spending $20 on apples because I didn't know how self checkouts worked

So today I went to the grocery store on my lunch break. Not a big trip, just going there for two things: cream of chicken soup (to make stroganoff) and bread flour (to make bread). While I was there, I saw a bag of honeycrisp apples for $3.50 a pound and thought "Sure, why not?"

So I head to the checkout and I scan the flour and set it in the bagging area. This is where the fuckup happens. I don't put the flour in the bag, I just set it next to the bag.

I then set the apples down, see that they're produce, and punch in the little code on the bag. The apples come out to like $20 with tax, and say that the bag is five pounds. I'm a bit surprised by this, but want to get home, so I scan the soup and put it and the flour in a bag and head out the door.

I'm to the door when it hits me. The flour. The five pound bag of flour. The bag of flour that's in my right hand and obviously weighs more than the bag of apples in my left.

Dear reader, the place where I put the flour was the scale. You know the thing where people scam self-checkouts by claiming that things are bulk flour? I did the opposite of that. I scammed myself and paid $20 for like eight apples.

Tl;dr: don't compare apples to flours