Developers
• Author is a SQL programmer
• Author is a COBOL programmer
Gamers
• Author has deployed Star Trek cloaking device
Windows users
• StickyShift malfunction
Insufficient ASCII support
• Author is writing on Wyse brick
• Author is writing on Apple II
• Analog output from Latin printing press

I can’t really think of any other reasons.

• CAPSoff, an online campaign to remove the CAPS LOCK key
• One Laptop per Child machine doesn’t have a CAPS LOCK key.