By using UPPER CASE to EMPHASIZE a point. Because if you don't use UPPER CASE, no one will understand what you're ATTEMPTING TO COMMUNICATE in an e-mail.
Rudely standing in front of the half-and-half and carrying on a conversation (that means you Senate staffers in Russell's Cups).
And standing right in front of the elevator door when you know there will be people getting off (yes, you staffers in Russell, again).
