当光头强遇到灰太狼
[dāng guāng tóu qiáng yù dào huī tài láng]
Referring to characters from Chinese children’s animation, this combines two distinct personalities or roles – Bald Qiang, a diligent cutter of trees; and Big Bad Wolf, always plotting schemes but often failing – meeting each other, indicating situations where opposites confront or interact.