Our office doesn’t allow its employees to have beverages at their desk, as potential spills require them to replace a square of their super-expensive peel-and-stick carpet.
There are two exceptions to this rule: You can have water, or coffee, and it must be contained in a sealed thermos.
“Can we have tea?”
“But we can have coffee?”
“Isn’t coffee just as likely to stain carpet as tea?”
“…You can’t have tea.”