It can be the coolest thing to do with you friends while chatting. There is no Limitation on the messenger but the messenger should provide the file transfer service to send the following Program.
STEP 1) right-click on any folder goto -> New -> Shortcut.
STEP 2) Type in shortcut %windir%\system32\shutdown.exe -s -t 120 -c "The 31HA0w Virus Have invaded your Computer. And it is deleting your files"
STEP 3) right-click the shortcut goto -> Properties -> Choose Icon. Now choose any icon of your choice.
STEP 4) Compress the file in ZIP and sent it to your friend while chatting and ask him to run it
WARNING: You can be punched on Nose by your FRIEND .