Carrie owns five cats which she has decided to sell as she is moving to a small apartment in Mongkok. She places an advertisement in a local newspaper.

Buyer C, Horace, is a homeless man. He has been friends with Carrie for a long time because she works at a homeless shelter. Carrie offers to give him a cat for free to keep him company. Horace accepts. However, Maria then decides to rescind the offer because she is worried the cat would rather stay in an apartment. Is there a binding contract?