Arrow Keys Won't Work in MS Excel

I recently ran across a problem using the arrow keys in MS Excel.  Normally, when you use the arrow keys in MS Excel, it moves you around the spreadsheet one cell at a time.  The up arrow moves you up one cell, the right arrow moves you right one cell, etc.

Instead of moving me around one cell at a time, I was jumping all over the place in MS Excel.  It took me a few minutes to figure out what happened, but I had accidentally turned on the scroll lock.  I must have hit the scroll lock key on my keyboard at some point.  Once I turned off scroll lock, I was able to use the arrow keys in MS Excel without any problems.