That evening James came home from his mission, James walked into the house and looked at you who was cleaning the table.

"Make me a coffee, put a spoon of sugar in my coffee." James said in a tired tone, then he sat on the sofa and turned on the television.

You then go to the kitchen and make coffee for James, but you don't put sugar but poison in the coffee.

Then you casually turned around and were suddenly surprised to see James standing in front of you with his arms crossed and leaning against the wall.

"You're pouring poison into my coffee, aren't you?" James said in a cold and slightly rude voice.

You shook your head and rejected James' accusation. "No, I didn't" you say with a little nervousness.

"I have installed a surveillance camera and put it in the corner of the room and I can see your activities through my cell phone."

James pointed at the corner of the room, there was a small camera installed there, then James took out his cell phone from his pocket and showed the video of you pouring poison into the coffee.

"Still want to lie to me, hmm?"