The emotions we admit to aren't always the emotions that we feel - fear and anger are a very common real/admitted emotion pair.
Write a paragraph (or two, if you're feeling ambitious) in which a character admits to one emotion but is really feeling a different one. Naturally, you don't want to tell us what the hidden emotion is - the character may not even realise what it is themselves, or may be trying to deny it. People often lie to themselves about what they're really feeling, especially for pairs like fear and anger - almost nobody likes to admit that they're afraid. Some common pairs could be: fear and anger, anger and hatred, fear and shame, passion and love, loneliness and despair, or even love and hate.
When critiquing others' paragraphs, you could tell us how well the emotions came through, and what you feel the hidden emotion is.