Today I went in, another strange time, another unfamiliar employee. (They have high turnover anyway.) I ordered my dozen, and while she was filling it, I mentioned, as politely and offhandedly as I could, to just make sure there were 13, because I only got 11 last time. I didn't want her to think I was blaming her; I just felt I had to mention it to someone there, so they knew. She said she'd be careful.
I got home and opened the bag to find 15 bagels.