Undo Tricks

If you use computers a lot, you probably find yourself out in the real
world wishing you had an Undo command (you know, like just before you're
about to smash your new car). Well, the "universal" undo shortcut is:

CTRL-Z

CTRL-Z is normally used in word processing documents, but it also works
just about anywhere in Windows. Let's say you accidentally drag an icon
to your desktop and really wish you had it to do over. Well, hit CTRL-Z
and the icon vacates your desktop and jumps back to wherever it was
before.

Works with Windows Explorer too. Let's say you accidentally delete a file. Instead of going to the recycle bin to recover it, hit CTRL-Z.
Note that this only works if you are sending the file to the recycle
bin. If you hold down the SHIFT key while you delete (bypasses the
recycle bin) the file is lost. All the CTRL-Z ing in the world won't
help.