According to Jim
Season 1, Episode 11: The Bad Word
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Cheryl leaves Jim in charge of their kids and some other kids who were there to play with the girls during a Bears game. The next day, one of the kids mom calls Cheryl saying her daughter dame home repeating a swearing she heard from Jim. Cheryl apologizes for him and Jim is insulted that she always automatically takes the other person's side. Cheryl apologizes, and not too later Grace repeats the exact same word. Jim decides to teach her not to repeat it by making her say it non stop until she can't say it again. It works. 5 days later, at Ruby's ballet presentation, she slips, falls and says the word, unmasking Jim's guilt.
All Episodes - Season 1
Episode 1
Pilot
Episode 2
No Nookie
Episode 3
The Cat Came Back
Episode 4
Anniversary
Episode 5
Unruly Spirits
Episode 6
The Crush
Episode 7
Cheryl's Old Flame
Episode 8
The Turkey Bowl
Episode 9
Andy's Girlfriend
Episode 10
An According to Jiminy Christmas
Episode 11
The Bad Word
Episode 12
Model Behavior
Episode 13
The Money
Episode 14
Blow-Up
Episode 15
Racquetball
Episode 16
Under Pressure
Episode 17
Date Night
Episode 18
Birthday Boys
Episode 19
The Receipt
Episode 20
Old Friends
Episode 21
Cheryl's Day Off
Episode 22
No Surprises