Here's a quick one:
A file is in the Trash, you double click it and get the familiar "The Document Can't Be Opened Because It Is In The Trash" dialog. What to do?
Sure you could drag it out of the Trash but unless you know or Get Info to find out where it was you may have to copy it someplace which, if it's a large file, may take up time and space.
You could use the "Put Back" command but won't show you where it went.
A: You can use QuickLook (Spacebar while something is highlighted) to preview it if the file type is supported.
B: You can also view the Trash in Column View and preview a file with the Preview column.