Due to a bug in MSN Messenger version 7.0 it is possible to nudge bomb someone. Normally, when you send a nudge there is a time out before you can send the next nudge.
Note: this bug has been fixed in more recent versions of MSN Messenger, I am not aware of a workaround, or a hack to turn it back on.
But if you set your status to Busy in MSN Messenger, you can send nudges as fast as you can (nudge bombing).
If you are the victim of nudge bombing, just turn receiving (and sending) of nudges off. Select the "Tools" menu at the top of your contact list and click on "Options...". Select "Messages" in the left selector, and remove the tick mark in front of "Allow me to send and receive Nudges".
Oh, and the goat you see in front of my display name is a New emoticon in MSN Messenger 7.0.