All actors get nervous when auditioning, but Will Arnett had his mind on something else when reading for Oscar-winning director Kevin Costner. On "Hot Ones," Arnett worried that he might relive his traumatic Kevin Costner audition, where he nearly had a bathroom emergency. 30 years after his worst-ever audition, Arnett again wondered if he might have an on-camera incident. Jason McDonald/Searchlight PicturesAs he did at his late-’90s audition, Arnett held himself together without a bathroom emergency. Is that even a thing?” Arnett asked while drinking milk to dampen the spiciness.