Tea.

 I was at this house, and they asked me if I wanted to drink tea. But I stopped drinking tea. And i didn't want to disappoint them, so I told them to bring a cup of hot water. So they did. I started sipping it as if it was tea. But, why don't you drink tea itself. No, this is tea, it tastes exactly like tea, I have tricked my mind to believe it's tea.

And at the end. I have just added few more people to my list of "people who ignore me."

I feel pleasant about these situations, making people mad without actually hurting them.

It's really an advantage, because you keep your friends list minimum just to get maximum benefits out of them.