Why I Prefer Self-Checkout

OK, calm down, cashier.  What I meant to say was that are you OK if I take my shopping cart, go back to get the packs of water that is on sale and just walk through and past the checkout line.  You obviously didn't let me finish because after I said, "Leave the waters here, take the cart back to get the correct ones ..." you had to jump in and say, "Yeah, that's why I told you to leave the waters there."  You really think I was just going to leave the cart and drag the bottles of water on sale from the back of the store to my car?

Maybe I'm wrong about his tone.  Maybe I shouldn't take things so defensively.  But maybe I need to reconsider where I do my grocery shopping because, once again, I had a bit of a run-in with someone there.  Shit, man, please don't make me go back to Target just because I can go check out myself.