Have you ever been typing a message to someone and suddenly EVERYTHING’S IN CAPS AND IT SEEMS LIKE YOU’RE YELLING AT THEM? Or have you used the numeric keypad to quickly input numbers, but instead the cursor jumps around the screen or changes to insert mode?
In these cases, the culprit is probably one of the toggle keys: Caps Lock, Num Lock, or Scroll Lock (don’t worry – nobody knows what Scroll Lock does). If you want to avoid accidentally enabling one of these keys, Windows can help by playing a notification sound when one of these keys is pushed.