Barney freaks out when Marshall bequeaths a "slap bet" slap to Ted and Robin. Meanwhile, Lily's estranged father shows up for Thanksgiving.
Quest roles:
Ned Rolsma(Marcus Eriksen), Robert Michael Ryan(Marvin Eriksen), Bill Fagerbakke(Marvin Eriksen), Suzie Plakson(Judy Eriksen), Christina Pickles(Rita), Charles Rahi Chun(Mr. Park), Chris Elliott(Mickey Aldrin), Dennis W. Hall(Leopold), Piper Mackenzie Harris(Lily Aldrin), Greg Lewis(Mr. Ossias), Krys Marshall(Bridesmaid), Jack Walsh(Morris), Marion Kerr(Whitney)