According to Jim (2001)

S3E9 The Imaginary Friend

In an effort to escape attending a baby shower for couples with Cheryl, Jim invents an imaginary friend. As he weaves elaborate stories about this fictional companion, he finds himself entangled in a web of lies, ultimately leading to unexpected consequences. As the day of the event approaches, Jim must confront his own creativity and the importance of honesty in his relationship with Cheryl. Will he reveal the truth or continue to hide behind his make-believe creation?