Taking something that is not yours is wrong.
Sue just got invited to the movies with her friends, but she has no money.
Sue wants to acquire cash.
Sue asks her brother Brent to borrow the money and offers to pay him back with interest.
Sue walks into her brother Brent's room and takes money from his piggy bank without asking him first.
Brent happily agrees because Sue and him both get a good deal.
Sue feels bad when Brent goes to buy the toy that he wanted he realizes the money isn't there and cries.