Why do lusers send screenshots in a .doc in a mail?

Not only does every single stupid luser do it, but even people who do otherwise look sane and do not ostensibly sport brain slugs always send screenshots as .DOC attachment with a picture inside. What's wrong with just sending the image file? If you can paste the screenshot into the dreaded Word, what's preventing you from pasting it into the atrocious Outlook's window? Yeah, what? And why? WHY??