The Brisker Rav asked his son each Shabbos whether he wanted an apple or a pear.  When he asked for a pear, his father gave him an apple.  And each week, he would give him the opposite of what he wanted.  Why did he act this way?

“It’s to teach my son that in life, we don’t always get what we want and we must get used to that.” Each person desires different things. If things don’t go our way and we don’t get what we want, then we must say to ourselves that Hashem made the best choice for us, and we must know how to accept that.  We have to learn to work on ourselves in this area.