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• Quick, Boo-Boo, hide the lunch basket! Here comes the park ranger!
• Hey Boo Boo!
• SMILEY :-( boo hoo
• Audience: Boo! Boo! Burns: Smithers...are they booing me?
  Smithers: Uh, no, they're saying "Boo-urns! Boo-urns!...
• Everything will be just tickety-boo today.
• Homer: Mr. Mayor, I hate to break it to you, but this town is infested by bears.
  Moe: Yeah, and these ones are smarter than the average bear....
• BOO! We changed Coke again! BLEAH! BLEAH!