What about the boy who can't afford the tuition for the computer science course, his best friend, a girl who he has just introduced to programming, gets a bursary to the course just because she is female? The boy feels that he is not wanted in the cs community because of this discrimination so he begins to pursue something different and the girl feels that she was given an unfair advantage over her friend and does not want to ruin the relationship so she pulls out of the course.

Anything like this that isn't based on merit or interest can be pretty devastating.