Cake knows when she is getting the shaft. She noticed that EVERYONE had a tea cup but her. When she protested she was given a different cup. But that wasn’t good enough either, she noticed that she had a mug and not a tea cup. So when Peanut was done eating she went to Peanuts chair to use her tea cup. She was, apparently, not going to miss out on using a tea cup if she could help it.