One day I was in a bored state, and my friend was there with me when I decided to look at her character's biography. Then when I selected her character, I stopped a moment to pause and look at the "block" option.
Then it hit me.
I was at first sitting next to my friend, when I felt in a "trolling" mood and blocked her. Obviously at this point it would have looked like I had dissapeares, which was what I wanted. I then skooched over to the opposite side of her, and unblocked her, so it appeared as if I had teleported.
At first her expression was "waitwhat." Then I did it a second time, moving across from her and unblocked her again. She kept asking me how I was able to do it, and I just continued on doing it.
By the time I stopped I was in tears from laughing, as she was mad at me (perfectly understandable, I was being rude, after all)
After I finished and stopped laughing I told her how I was able to do it, and she later laughed about it as well.
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There was another time where I had the lag glitch which made me become the "???" Person in a chat, appearing as if I was controlling her character. (This was with the same friend)
At first I was upset about this, because the map we had downloaded was giving me a hard time for me to get into.
Then I thought of something better.
Use this opportunity to my advantage.
I started up a conversation with her:
<???> Hello.
</Friend/> Why is your username ???
<???> What are you talking about?
</Friend/> ... Your username is ??? To me.
<???> Hmm.. I think you may have to restart your FH... Might be a bug.
</Friend/> Yeah.. Okay.
/Friend restarts, then comes back/
<???> Did it work?
</Friend/> No.
<???> Your computer might be broken.
I eventually told her, and when I did she had to get off for a bit because she had apparently felt stupid, but I knew it was just because she was laughing again.