This is possible but only if you have your name at the front, so first get Messenger Plus Live if you don't have it already. Then get this emoticon
and add it to Messenger, then go into Messenger Plus Live preferences > Conversations > Quick Texts and then make a new one and type this for the message: "/me <put shortcut of custom emoticon here> The following message could not be delivered to all recipients" and then do the shortcut in the conversation window and it should work. And you can also change the message so it says stuff like Antony slaps your contacts name and stuff like that.