Related Clues:

• Note from the brass
• Boss's terse summons
• Sticky Note, e.g
• 'F' accompanier, perhaps
• Words below a bad grade, perhaps
• Boss's nervousness-inducing note
• Words students fear
• Boss-to-employees communication
• Bulletin board posting
• "Now you ___, now you ..."
• Message sometimes written below 'F'
• Dreaded message on a returned 32-Down
• Terse meeting request
• Work order, maybe
• It might have the heading "Re:"