I fed my sis's fish to my cat...?

My little sister was driving me crazy and annoying me. She kept telling me that her stupid goldfish would win in a fight with my cat if it had the chance. So in the end I put it to the test just to freak her out and shut her up. Trouble is that I thought I would grab fluffy (her fish) and throw it back in its tank in time before my cat got to it....dam things are so slippery! Now fluffy is in Mr Whiskers tummy. Can someone give me permission to gag my sister to stop her crying?