Yup. This is a lot of fun lol.
Once I stole some kid's rsgp. He was like 13 or something. But it was almost like his family (dad, younger brother, older brother) all played RuneScape on the same account. I used the feature to listen to their mic and they were all fucking mad and yelling. They were also blaming each other and then I opened the chat. It was fun.
There was another time that happened something similar to what you did. I stole the gp and I was waiting for the dude to check his account. I was tired of waiting for him (like 5 minutes) and then I sent a message box saying something like "hurr whers mah monei" then he made some expressions like the one in your thread. Then he just disappeared, I think he went below the desk to unplug everything lol.