The scrollbar.

Origin Story:

IT: IT, this is Help Desk Techician Number One
User: Hey. I’m missing my up and down thingy (scrollbar) in my Outlook Inbox, but I got it in my Sent folder. How come?
IT:...... Uhm... my guess is that you don’t have enough mails in your inbox to show the scrollbar... how many mails do you got in there?
User: I have six mails.....
IT: ......
User: Thanks for your help, bye!