yank one's chain

yank one's chain (to tease someone or to joke with them; to try to convince someone that something is true when it is really false) — поддразнивать; издеваться (дразнить); прикалываться

EXAMPLE of a daughter speaking to her father:
"I'm serious, Dad, is there really a spider in my bedroom?"
Reply: "No, sweetie, I'm only yanking your chain."

Variations:
"You're yanking my chain, aren't you?" — Ты что, издеваешься надо мной? or "Stop yanking my chain." — Хватит прикалываться-то надо мной.

[прикалываться]