After I had eaten the small portion which sufficed to fill my stomach halfway, Brother David casually mentioned his belief that it was an offense against God to leave food uneaten on the table. This was particularly the case when such a great restaurant had so clearly been placed in our path as a special grace. David was a slim man and a monk, so I found it hardly credible that he followed this precept generally. But he continued to eat so much that I felt good manners, if not actual spiritual guidance, required me to imitate his example. I filled my belly for the first time in a year.
The popular "topic of your choice" option had been removed from the Common Application between 2013 and 2016, but it's now back again for the 2017-18 admissions cycle. Use this option if you have a story to share that doesn't quite fit into any of the options above. However, the first six topics are extremely broad with a lot of flexibility, so make sure your topic really can't be identified with one of them. Also, don't equate "topic of your choice" with a license to write a comedy routine or poem (you can submit such things via the "Additional Info" option). Essays written for this prompt still need to have substance and tell your reader something about you. Cleverness is fine, but don't be clever at the expense of meaningful content.