Oh, I have one...
Upon witnessing an unusual endeavor, someone quips, "He has too much free time on his hands," or some variant.
Nowaday, many people say or write that almost as a Pavlovian response without really thinking about it because so many other people have repeated it. But, when you do, it implies you consider said person's endeavor is meaningless, wasteful. Why hasn't this person used that period of time to engage in something more productive. The irony is what you may consider "productive", yet another person may consider a waste of "free time".
Like I stated at the beginning, a fair percentage of people who use that phrase possibly use it as nothing more than a substitute for astonishment like "wow" or "golly". But the phrase itself reads as disapproval.