MSN Multi Line Nickname trick

1) Just go to Personal Settings and delete your current nick. Then hold ALT and press 0160 (with your numeric keypad on a Standard US keyboard). Press ok et voilà!

2) The "hard enter" has been around for ages. It allows you to make a multi-line nickname. However, Microsoft has disabled the possibility to type it manually. Here's workaround to have multiline nicknames:-

How can I have multiline nicknames again? 
Halfway November 2003, Microsoft blocked certain characters from being used in your MSN Messenger name, including one that allowed you to create multiline nicknames easily. If you want your nickname to consist of multiple lines, you'll have to download the latest version of the Messenger Plus! add-on.

1) Open a conversation window
2) Type /nick followed by a space and then your desired nickname, using [SHIFT]+[ENTER] to insert line breaks.
3) Press enter and your nickname will change.