Rock Paper Scissors as the slave

Last night Master challenged me to a game of rock, paper, scissors as I was sweeping.  

First round:  I chose scissors.  He chose scissors. Tie.

Second round:  I chose scissors.  He chose paper.  He covered my scissors with his paper.  "I win", he said gleefully.

My mouth dropped.  In a second, I came back with "Why?"

"Because I can," he smirked at me.

"I think I'll go back to my sweeping." 

No, my eyes weren't rolling.  Much.