The Chicken Biscuit

This morning I was late for work. I didn't have time to make breakfast, so I decided to stop by a local restaurant for a chicken biscuit.
As I entered the restaurant, I remembered an email sent to me at work: Teachers get a free chicken biscuit with id.
During my order, I asked the waiter about the free chicken biscuit. and whether it was still available. He said, "Yes, with an id." I showed him my id, and the interrogation began.
"How long have you taught at the school?"
" I graduated from the school; I don't remember you."
Again, I showed him the id, and he acquiesced. I save around $3.50 despite the embarrassing interrogation.
I arrived at work. This may have been the best chicken biscuit ever.
Just as I was finishing the chicken biscuit, a colleague offered me a free chicken biscuit from the same restaurant without the interrogation. I was full, so I declined the offer.