Half-Cent Muffin?

I was at a cafe today and noticed a bunch of a muffins on a plate near the cash register. In front of the plate was a nicely decorated, color-coordinated sign that said "Muffins: .50 cents" (hmm...imagine there is a cents sign after the 50 as there doesn't seem to be one in the font list here...). I really wanted to grab two, put down a penny, and say thankyou and walk away. I know that they obviously did not mean that a muffin cost half of a cent, but I was very annoyed that they would make such a mistake. Things like that bug me.