It's nice to return kind gestures.
Jim is moving residences and asks his friend Bob for help moving which he is happy to provide.
Jim wants to thank Bob for his help moving.
Jim repays Bob by buying him a 12 pack of his favorite beer.
A few days later Jim sends Bob a short text message to tell him thank you.
Bob feels appreciated by his friend and is happy to have helped out.
Bob feels a bit unappreciated by his friend Jim and reconsiders whether he will help him again in the future.