It is nice to buy gifts for other people
Dani is on her way to a graduation party for her sister.
Dani wants to congratulate her sister.
Dani buys her sister an elaborate gift that she knows her sister will enjoy and gives it to her at the party as a congratulations.
Dani verbally congratulates her sister and then ignores her for the rest of the party.
Dani's sister appreciates the thought Dani put into picking out the gift and is really quite happy.
Dani's sister notices that she didn't get a gift from Dani and holds a grudge.