Possible Clues:

• 'Anonymous' on a Valentine
• 'Identify me'
• Hands-over-the-eyes words
• Phone caller's "Bet you don't recognize my voice!"
• Costume-party question
• Milton Bradley game featuring facial features
• Comment made while covering someone's eyes
• Hands-over-eyes question
• Huge sows produced by ?? That's the question you'll have to have a stab at!
• Game in which a player might ask, 'Is your person wearing a hat?'