"Coach" Jack Wittenberg is a fictional character in the Hey Arnold! TV series. He has been Arnold's basketball, bowling and synchronized swimming coach; who speaks in consistent malapropisms. His coaching skills are limited at best, and constantly requires the help of the team he is coaching (often from Arnold). He is the husband of Tish and the father of Tucker. He also struggles to pronounce certain words, phrases and people's names. for example, Coach Wittenberg always refers to Arnold as "Arnie" (not referring to Arnold's cousin) and psychology as psycho-chology.