It is rude to ignore someone's birthday.
Amy's friend Tory is having a birthday.
Amy wants to avoid going to the mall.
Amy calls Tory to wish her happy birthday and tells her that she'll take Tory out for lunch next week.
Amy is too tired to go to the mall to buy a gift for Tory, so she acts like she forgot  it was her birthday.
Tory is very happy and has a fun birthday lunch.
Tory is hurt and doesn't buy Amy a present for her birthday.