I am a horrible person for face-palming at this.

A review of a restaurant:
"I ordered a turkey burger. After eating almost 1/2 of the burger, I knew something was just off. When I had the waitress check to make sure it was a turkey burger, she said, "Yes it is," but took it to the kitchen to check. The manager then came out and confirmed that the burger was actually a BEEF burger. [...] In my 28 years on this earth, I've done my very best to follow my religion and not partake in eating beef. It hurts that your business was the cause of me breaking that oath."

It took almost half the burger to realize it was something you have literally never eaten before, especially assuming that you HAVE had a turkey burger before?
I respect your religious beliefs and I understand that you are upset that you were eating beef against your will - that shit isn't right. But if you feel that strongly about it, you have to alert your server. Make sure it isn't cooked in the wrong pan, or that the grill is cleaned properly, so there's no cross-contamination. Just like an allergy.

I'm sorry this mistake was made. I'm sorry you feel if you have disrespected your religion. I'm sorry if your tummy got upset over it. But seriously, HALF the burger?