i would like a plugin that allows me to set the e-mail that is displayed to whatever i want in order to play tricks on my friends.  make people hate them, etc...  yes, i know this could be bad for others.

Try Anonymail.

You can use it in a conversation window as
/xanonymail "from email" "subject" "message"
to send an email to the person you're talking to, and you can use

/xanonymailto "to email" "from email" "subject" "message"
to send to a specified email address.

Oh my gods, remind me not to ever be your friend... Why do people insist on doing things like this? :/

And people wonder why my contact list is so "exclusive"

Yes it is just stupid as well as Messenger Discovery's Imitate feature. Its just encouraging immature behaviour.

I dunno what ppl even think while making such plugins cause i cant think of any good use of both these plugins. Only bad ones

Oh come on people, its a bit of fun.Its not like its a virus or its flooding your computer, just a bit of harmless funand i would use the plugin if someone did make it