is often prone to violent and uncontrollable mood swings. During puberty, she went through violent outbursts during every development, such as having to wear tampons (and ruining the family's white couch by sitting on it while wearing a skirt), being disappointed over how small her breasts were when they finished growing, and getting an enormous pimple. These mood swings terrified her parents and they were fearful of the same problems in her brother, although it is shown Steve has had his temper more under control. Another episode revealed that Hayley flies into a rage when men break up with her. It had gotten to the point where Hayley will have to go to jail if another relationship she has falls apart. While still the most empathetic and possibly most sensible member of the Smith family, Hayley's generally intelligent and independent character becomes more at doubt in later seasons. Even upon moving back under her parents' roof, she is no longer an official student at Groff and once even claims that she always drops back out before term papers can happen and once even hinted that she planned on freeloading off her parents into her adult years. At this point in later seasons, Hayley's morality, sensibility, and seriousness have become much further in comparison to the rest of her more shallow, reckless, and muddled family members, and even Roger. In "The Kidney Stays in the Picture", when Hayley needs a kidney transplant after drinking more liquor than she can handle, Stan immediately volunteers to have his kidney surgically removed to save Hayley. Francine greatly admires Stan's dedication to Hayley, but sheepishly admits Stan's transplant might result in organ rejection as she is unsure if Stan is Hayley's true father. Stan and Francine go back in time, and it is never revealed who Hayley's real father is as Stan requested that his kidney be taken out regardless and the doctors perform the transplant without revealing which kidney is used. The other potential father to Hayley is Joel Larson, a complete stranger who Francine slept with three days before she and Stan got married. When the doctor asked how they got the other kidney for Hayley, Stan said, " I called in a favour." It was later revealed that Roger cut into Larson's stomach with a keyhole saw, getting the kidney. In season 5 episode 15 "Merlot Down Dirty Shame" it is revealed