Only Grimm wasn't play-acting.
She has lived a hospital-like existence for three years because of the failing health of her husband, Roy Grimm, who now requires hospice care at home for frontal lobe dementia.
"It's like watching a snowball go downhill," she said in a private moment after class had ended last Wednesday.
Joanne Grimm and her Stagebridge group of elderly amateur thespians had portrayed dementia-like scenes for future caregivers.
The scenes are intended to show them "how devastating it can be," Grimm said. "The change in Roy's personality was instant. One minute he was fine, the next minute he wasn't."
Oakland-based Stagebridge was founded in 1978 by Stuart Kandell who saw the need to give the retired and elderly something fun to do, such as becoming senior-citizen Russell Crowe and Cate Blanchett wannabes.
This concept led to improvisational performances, generally in front of school kids and other seniors, often in care centers.
And Grimm and others in Stagebridge have become convincing actors in spite of their inexperience.
"Stagebridge is my safety valve, the one thing I do for myself," Grimm said. "I can come and be someone else for a few moments. So there's these moments of laughter and I like to make people laugh.
Grimm, 74, joined Stagebridge seven years ago after completing a 27-year career in local education, the final eight years as principal of Oakland High School.
Roy Grimm, 82, spent nearly 34 years at the Oakland Tribune, retiring as managing editor my boss in 1989.
He fit the editor's image, smoking a pipe, measuring his words carefully, alternating between stern looks and a wry sense of humor and widely respected for his tough, but fair news judgment.
"Roy Grimm is an institution within this institution," said then-Tribune publisher Robert C. Maynard at Grimm's retirement ceremony.
Eighteen years later, Grimm islocked tightly inside the grasp of a disease that won't let him go. Amazingly, he has been pragmatic throughout.
"His initial reaction to what he had," recalled his wife, "was 'you play the hand you're dealt.'"
He has maintained a sense of humor even though he's now in a wheelchair, he doesn't talk much because of his confused mental state, he can't watch television because of a loss of perception and his appetite is gone, thus he's losing weight rapidly.
His wife of 53 years realizes his life is ebbing away.
"He took care of me the first 50 years of our marriage," she lectured the nurses, out of character, "and now it's my turn to take care of him. My feeling is that's what a marriage is; I'm devoted to him."
Their range of topics is limited, but politics always seems to work.
"He voted in the last election, but can't write his name," she said during an interview. "We used to have tickets to the Oakland Symphony.
Now he listens to nothing but Willie Nelson. And he never liked country music."
Roy Grimm had smoked a pipe since he was 18. Then one day, 50-some years later, he couldn't load it or light it.
However, while dementia takes away, sometimes it gives back.
"Three days ago, he simply picked up the pipe, lit it and smoked it," she said. "That's the way this illness works. It's like we have today, let's hope we have tomorrow."
Joanne Grimm smiled, grimly, at the novelty side of dementia.
"You have to look at all of this as funny, actually," she said. "If you just look at the downside of life, you have a choice: You can just sit there and cry or ... ."
Lament? One of the Grimm's three children, son Scott, was shot in a drive-by shooting two years ago.
He was hospitalized for a year and spent eight months in critical care. He's fine now, but it was one more crisis to deal with for this already burdened family.
"When I get to heaven," said Joanne Grimm, "I'm going to ask God if he has me confused with Job."
Dave Newhouse's column appears Monday, Thursday and Sunday, usually in the Metro section. Know any Good Neighbors? Phone 510-208-6466 or e-mail email@example.com.