Mother's Forgetfulness

Xiaoming is very upset, because his mother often forgets to buy him the things he wants. That day, as Xiaoming sees his mother out the door, he says to her, "I want chocolate cake, please remember to buy it for me". His mother promises and heads out. After leaving home, she gets on a bus. When she gets off, the conductor reminds her, "Don't forget to buy chocolate cake". She thanks the conductor for the reminder, feeling confused. After getting off, she walks into a restaurant to eat. When she finishes her meal and goes to pay the bill, the waiter reminds her, "Don't forget to buy chocolate cake". She thanks the waiter for the reminder, feeling confused. After leaving the restaurant, she goes shopping at a supermarket. When she has finished picking out the items she needs and goes to the checkout counter to pay, the cashier reminds her, "Don't forget to buy chocolate cake". She realizes she didn't buy the chocolate cake, so she hurries to the shelf to get the chocolate cake, then comes back to pay. After finishing her shopping, she goes back home. Thankfully, this time she finally didn't forget to buy what Xiaoming needed.