UPDATE: This post has been updated. Scroll to the bottom to see the info.
So several players figured out that using the /getdown command would not only cause your character to start dancing but would also interrupt any casting that your target was attempting.
Here’s a video of it in action:
We’re not sure if it worked in PVP, and have no intention of testing it, but suffice to say, Bioware did not approve of this and players were promptly sent emails similar to this:

(Click for full-size.)
Source: Reddit.com/r/gaming
UPDATE:
Biowares Community Manager: JovethGonzalez has jumped on this and has this to say:
Just wanted to let you know that this email is a fake. There are no such things as “special dance zonesÔÇØ.
Nobody puts our players in a corner.
Everybody is free to get down.We are NOT banning players for the use of emotes.
Source: The Official Forums.
Biowares’ Stephen Reid addresses why certain users where banned. (Several of the users posted on the official forums, as well as Reddit, that they’d been unfairly banned/suspended.)
Stephen Reid starts his post with this:
Our Terms of Service team recently took action against some accounts playing Star Wars: The Old Republic, and we wanted to give you some insight into what happened and why.
You can read the entire topic here:
http://www.swtor.com/community/showthread.php?t=120099