Possible Clues:

• '___ walks into a bar ...'
• 'What's ___ gotta do...?'
• "It's ___ thing"
• 'So ___ walks into ...'
• 'What --!' ('He's the best!')
• '-- walks into ...'
• "___ walks into a bar ..."
• '-- walks into a bar ...'
• 1941 comedy, "A Girl, ___, and a Gob"
• 'When you see -- ...'