Maybe you have a list that you want to put in a random order. I had a list of words that I wanted shuffled without repeating. At first, I was thinking that I'd have to devise some way of choosing at random without replacement, so that Get-Random wouldn't choose the same word twice.
Then I found that Get-Random has a -Count parameter, so I thought: could I make the count the same as the number of items on my list?
Of course! Why did I even question?
However, I did learn that the count cannot exceed the length of the list. If it does, PowerShell won't complain; it will just stop when it has listed every item once.