I'll pay that
This is when you're so confused by what someone said, you just let them win. Like you’re the referee and you’re too tired to call the game.
"I'll pay that," he said, after I told him the moon was made of cheese.
She said, "I'll pay that," because I explained why the sky is blue, and she had no idea what I was talking about.
He said, "I'll pay that," even though I told him 2+2=4.