It started with what they called "Summer Wednesdays" - during the Summer, the company would sponsor an outing to the beautiful beach nearby every Wednesday at lunch.
Then you could come back to office or work from home.
Soon, people started to go to the beach earlier and work from there unless there was a client meeting onsite. One team member (she was in sales) even did her client meeting at the beach.
Team morale drastically changed. Since they would be at the beach, they wanted to have some fun while at the beach - so they shifted the work they got done to the 4 other days.
No more boring meetings - only those meetings everyone really wanted to be on happened. Everyone else was busy working. Teamwork went up because they wanted to be at the beach on Wednesday and have fun instead of coming back to work later.
The performance metrics were so phenomenal next month that management had an informal meeting with the team that basically allowed people to work 4 days a week.
Those who agreed had to sign an addendum to their employment contract that they had taken up the offer for people to work from where-ever they wanted one day a week without needing to come to the office.
I did not like this opacity so when I queried I was told that investors won't sanction this in any shape or form and this would be the only way to pull it off.
Interesting.