Yes, a place where I used to work once sent out a memo trying to encourage more regular work hours because management couldn't find people, and the office always looked half empty. The thing is, it was the operations staff for a astronomical observatory. The "missing" people were generally traveling and/or working at night!
I used to work in research physics and recall hearing a similar story, probably embellished with each retelling. The version I heard had the staff complying with the order and working 9-5, then management complains that no observations are being made at night.
Well, in this case, I personally received the memo. Knowing my co-workers, however, I highly doubt anyone actually changed their behaviour due to it. Other, similar, management antics included scheduling meetings first thing in the morning and complaining that the telescope operators never showed up.
