USay is a nice script to add to the MSN Messenger that allows you to usurp the nick of the person you are chatting with, that is, it will seem that what you write is written by him because he goes out with his nickname. This produces a lot of confusion and fun, especially if there are more than two people added to that conversation.
Even Usay can imitate the style of the font that the other person is using (only from version 1.1), so the letters will be identical and you will impersonate him much more convincingly.
This script only works by installing it in Windows Live Messenger or in Messenger Plus Live.
You can free download USay 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.