It's nice to wrap presents for people.
It's Jerry's sister's birthday soon and Jerry just bought a nice present for her.
Jerry wants her sister to think he is generous.
Jerry decides to make an extra effort and takes the time to wrap up the gift nicely.
Jerry feels it's not necessary to wrap up the present and just puts it in a plastic bag before giving it to his sister.
Jerry's sister feels the beautiful wrapping is an other proof of Jerry's affection for her.
Jerry's sister appreciates the nice gift but feels Jerry is a bit sloppy in his gift-giving.