9, hypoglycemic HouseGuest Amanda Hansen fainted and had a seizure after only a few days of being on the slop diet, while HouseGuest Allison Nichols had an allergic reaction to the slop; both women were medically evacuated from the house, though they returned the following morning. In some seasons, a HouseGuest can also win a Never-Not Pass which they would be immune from being a Have-Not for the season's remainder. Since second All-stars season, subsequent weeks forego "Have-Not" competitions and instead, either the Head-of-Household or the previous recipients of "Have-Nots" decide the next "Have-Nots" for the week, with the exception of a few weeks which reset the process, such as weeks without a "Have-Not" phase or a competition is held. The choice of decide the "Have-Not" can be of any HouseGuests except for the reigning Head of Household or the incumbents, or one team in the case of teams (first seen in Season 23). HouseGuests can be penalized for not following Have-Not rules, which is usually incorporated with a penalty vote for eviction, or in some cases, an additional day of a Have-Not. A controversy occurred during Season 21 where eventual winner Jackson Michie also broke the rule, but was not issued a penalty due to the obstruction of the camera view behind the shower walls while eating non-slop, resulting in the Have-Not being unseen for the remainder of that season. The HouseGuests also frequently compete in luxury competitions during their time in the house, with most frequently, the right to watch a film or television show in the house, or a small cash prize. When competitions for films or television shows occur, an actor or actress from the series may enter the house to host the competition or speak with the HouseGuests. Actors such as Jeremy Piven, David Hasselhoff, and Neil Patrick Harris have all entered the house to participate in luxury competitions or rewards. Battle of the Block The Battle of the Block was first introduced during season 16 and was reintroduced during the following season's premiere. Instead of the normal singular Head of Household (HOH), two HOHs were named for that week. Each would then nominate a pair of nominees. These two pairs of nominees would compete against each other in a competition. The winning pair would receive immunity and if nominated, the and incumbent HOH that nominated them would be dethroned and losing immunity, allowing the