My worst moment: Melissa Gilbert and the perils of being on the set of ‘Little House on the Prairie’ with cowboys and their spit cups

CHICAGO — Melissa Gilbert is in Chicago for the next two months, starring in the play “When Harry Met Rehab,” playing opposite “Frasier” alum Dan Butler.

“It’s based, more or less, on the true life of Chicago sports radio personality Harry Teinowitz, who is one of the authors of the play” said Gilbert. “I play the therapist who is also in recovery and is a former magician. It is a comedy, albeit one that deals with the issues of recovery seriously. But a dark sense of humor is important.”

Gilbert was in Chicago earlier this year with her husband, the actor and director Timothy Busfield (“Thirtysomething” and “The West Wing”), who