The context of the following conversation is After they realized that it was not really their mother's birthday Aubrey finished serving their breakfast in bed, anyway.:
Aubrey says We made breakfast in bed for my mother 's birthday. Then she told us her birthday was on the 5th, not the 3rd..
The friend responds Oh wow. Were you guys embarrassed?.
Aubrey responds Yeah, I can't believe we got it wrong. We gave her the food and gifts anyway..
The friend responds You should write it down on a calendar..
Aubrey responds Yeah, I'm going to put it in my cell phone calendar..