I have been doing this for ages to cause chaos and dismay.
if you create a macro that does
/invite Name
/random #
they will see on their screen "Player rolls #
now here is where the fun begins, you can do this with more than one person at a time so!
/invite guy1
/random 1337-1337
/invite guy2
/random 1337-1337
/invite guy3
/random 1337-1337
ect, all these players on your script will see that you have rolled 1337-1377 . This effect CANNOT BE IGNORED, even if somebody has you on ignore it does not stop rolls from being viewed, and this effect works even if they are already in a team and it does not matter what zone they are in or how far away from you they are. I did this to an enemy guild on a lvl 1 while they were raiding after their GM called me a ****ing whore and a noob gimp!
Enjoy and make your enemies suffer!