Typing BIGBUX enters an extra $10,000 in your checking account
Typing HITMEDEALER increases the interest on your savings account to 25% APR
Typing THERESGOLD diverts all profits from MS Money into your bank account
Netscape Communicator 4.5
Entering WHOABABY into the location field gives you unlimited access to porn sites
Entering NONOTTHAT removes all links to pages that spell "cool" as "kewl".
Entering FORGODSSAKESTOPITRIGHTNOW turns off blink.
Microsoft Excel 97
Moving the cursor up, then down, then up, then left, then down, then up makes using a spreadsheet seem slightly less dull for about two seconds.