Don't know if anyone else already posted this. I found this link on the internet.
It is a YouTube video of Cindy Williams being interviewed.
Cindy Williams wrote a book in which she tells of being a waitress in the mid 1960s ( approximately) and she was in a bar and grill in which Jim Morrison reportedly played a cruel trick on her.
Actually in the video she says that the the entire staff of the bar and grill were in on it.

What would you have done if you were her?

BTW, I had not seen Cindy Williams in any TV show or whatever in a long time. She actually does not look much older here even though she has more muscle now. I have not seen Penny Marshall recently either. I hear she actually was hard to get along with and did not treat Cindy Williams very well on the set.


https://www.youtube.com/watch?v=3DdTuA9PRyI

"Laverne and Shirley" star Cindy Williams has penned a memoir, sharing factoids about the classic 70s TV show, her memories from the set of "American Graffiti," and stories about funny friends Andy Kaufman and John Belushi.

But there's one story from "Shirley, I Jest!" that sticks out: the time Jim Morrison played a cruel prank on her.

Before she shot to fame, Williams was a waitress at famed L.A. restaurant and music venue Whisky a Go Go. On her first day on the job, Williams served the Doors frontman.

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"They said that's your first table and I said, 'Wow, the VIP section, I must have done something right.' So I saunter on over – mind you, I’d only waited tables at the House of Pancakes before this so now we’re going from pancakes into hard liquor," Williams recounted to FOX411. "So I go over and there were these two blond girls and this gentleman who had his back to me and so I asked the ladies first, took their order and I remember: Tom Collins, Tom Collins and then I said, ‘And you sir?’ And he turned around and it was Jim Morrison!"

Williams said Morrison ordered a bottle of Jack Daniels, but when she went to put in the order at the bar, the bartender told her she was not allowed to serve Morrison a full bottle of liquor.

"So I went back to the table and said that I’m sorry Mr. Morrison but I’m not allowed to serve you a bottle of Jack at the table. I can bring you a double, or a single? And he said, ‘who’s tending bar, Tony?’ and I said yes. And he said, ‘You go back and you tell Tony that I want a bottle of Jack on the table.’"

Williams said she went back and forth between Morrison and Tony the bartender until she was in tears.

"Finally I said to Jim Morrison, ‘I’ll buy you a double, but I’m not allowed to serve you a bottle of Jack at the table, I’m so sorry!’ and he asked for my name and I said Cindy and he took my hand and said, ‘Well, Ms. Cindy, we’re just playing with you. Bring me a double.’"

Watch the video above for more of Cindy Williams' stories.

https://www.foxnews.com/entertainment/jim-morrison-pulled-cruel-prank-on-laverne-and-shirley-star-cindy-williams

Winifred Hervey, who wrote for a whole ton of shows including The Golden Girls, but got her start writing for Laverne and Shirley, said (https://interviews.televisionacademy.com/interviews/winifred-hervey?clip=28151#interview-clips) that L&S was not considered a 'cool' show. She suspected that Cindy Williams' ambivalence about the show at the time came from that. This was especially after doing a collection of highly regarded films like The Conversation, Travels with My Aunt, and American Graffiti.

At the time, there was huge 'class' divide in Hollywood between TV and films. So at the time, it must of been bittersweet for Cindy. She was a huge star for a while because of this show but there's also reason to believe that she had a bit of an ago and thought that the thought the show was 'beneath' her. L&S as it was, wasn't exactly considered a "high art"-quality sitcom of its time like All in the Family or The Mary Tyler Moore Show.

I know that she did a campy movie musical before starring on L&S, The First Nudie Musical.

Cindy Williams explained on an interview featured on the DVD that it was set to be released just as L&S was catching on and CBS was trying to stop Paramount from releasing it, but under contract it had to come out.

I don't think anything major happened, though.