Why am I so paranoid?

I stopped by the store today because I was out of toothpaste. After I picked it up, I was looking at the toothbrushes, and it occurred to me that mine could use replacing. So I grabbed one too. Then, as I'm leaving the aisle, I spot bottles of mouth was and I figure I might as well grab one of those while I'm there.
But after I pick it up I get this mental image in my head, where I go up to the register to pay, and the cashier looks at my stuff and says "Oh, someone must have told you that you have bad breath."

I put the mouthwash back, and paid for my stuff without ever opening my mouth.