Replying to Funniest thing you've ever heard

I was sitting at subway with my friends and we were not in the right state of mind. So were in the booth and my friend starts talking about his sister and how she is fat. He compared her to one of those blob things that you jump on and it sends the other person flying. Well, he was saying that you can jump on her and her body will jiggle. After that he said this "yeah she weighs about 180-190" and we all just started laughing. Post any similar stories