It is good to express thanks when people help you
Anthony is in the process of moving and plans to do so every day for the next week.
Anthony wants to enlist the help of his friends.
Anthony's friends help him move heavy furniture for two days straight, and he thanks them by taking them out to dinner.
Anthony has his friends help him move heavy furniture for two days straight without thanking them.
Anthony's friends feel appreciated and stick out the work week until the move is complete.
On the third day of the move, Anthony's friends don't show up to help.