Empty Private Chat Window

We can create an empty private chat window with
another chatter by this trick. The recipient will only see an empty
chat window opened without any message being received.
This trick can be done using those emote commands, which do not work if
the recipient's username is not written (like slap, rose). To do the
trick, just open a private chat with someone and write any of the emote
commands, that doesn't work if the recipient's username is not written
(Example: /slap).
Other emote commands that can be used in this trick:

(/boo), (/congrat), (/comfort), (/cmon), (/french), (/glare), (/hold),
(/pinch),(/poke), (/ruffle), (/snuggle), (/slap), (/tag),(/rose)