During the first part of this school year some of my students were caught in a similar situation.  They would come down to my classroom during the lunch break for "playtime".  One day, I happened to visit my class during this time and found that one of my boys had been 'handcuffed' with his own belt.  The whole situation seemed odd so I grabbed the handcuffed student's hands and pulled him off to the side to ask him what was going on.  I asked him in both English and Korean and he just shrugged his shoulders as if to indicate it was no big deal and that their playtime was indeed that and not "playtime".

I came to find out a week later that one of the other boys, one of his 'friends', had been tying him up, beating him, and taking his lunch money for about two weeks.  Needless to say, I felt the same rise to action you do now.  Fortunately, my co-teacher, who is absolutely amazing, handled everything and taught the other kids who saw all of this going on but didn't intervene in some way that their actions were not honorable, as students or as decent human beings.  She stuck it to them pretty hard and then had meetings with the parents of all the kids involved.

I spoke to the students myself to let them now how deeply upset and disappointed I was with them and it was obvious that they took it to heart.   Fast forward two weeks later and several of the boys involved come running to my classroom to inform my co-teacher and me of some bullying incident happening at that moment.  It was beautiful!

I wish I had some good content to offer up.  I guess I just wanted to share that anecdote in order to offer some encouragement.  I appreciate what you're trying to do and I know that speaking to your kids about this will make a difference in/for some.
Good luck with the lesson~Cheers!

Thanks for your comments, I really appreciate it!  I've already done several lessons on bystandership, including showing them Freedom Writers, Glee, and several presentations about the Holocaust, but the information doesn't seem to stick for very long.  I think time for a frank dialogue about it is a good course of action!   

Here's one worksheet set I found somewhere on the internet.

I'm planning on doing a lesson on bullying as my school is raising awareness on it at the moment.

I've put together a PPT on it, but my main aim is to get them actually talking about it as a discussion class. I also found this lesson plan idea (attached) from www.esl-library.com and thought I'd share it.

I also found these clips...
>>http://movieclips.com/JyT6-bully-movie-trailer-1/<<
>>http://movieclips.com/AaKG-drillbit-taylor-movie-matching-shirt-geeks/#.UFvIMFTpMAY.facebook<<

... and these newspaper articles from other threads on here, that I thought would be good to use.
>>http://english.chosun.com/site/data/html_dir/2012/01/17/2012011700696.html<<
>>http://english.chosun.com/site/data/html_dir/2012/04/19/2012041901407.html<<

I also adapted the worksheet that Shhowse posted too.

Hope this is useful.... :D

FOLLOW UP:
Ok so I've been doing this class this week with my G1 and G2 students, it actually went really well! They were very responsive and vocal, and they enjoyed the video clips. I also did the screwing up the piece of paper thing at the end (see below link, it's included in the PPT) and they were all like "Whooooaa!"

You can easily adapt this lesson to include role plays, but I found it easily filled up the 50 mins. If you get through the PPT with a few mins to spare, there's a video you can discuss (the "A final thought" slide). I did amend this later by adding in some Korean words (thanks to my co-t) for some of the lower G1 students who didn't understand some of the vocab.

Good luck and be sure to raise awareness on this important issue!!

Here is an attention getting opening activity to start off the bullying topic.

I did this at the end of my lesson on bullying, and it went down really well! Thanks for sharing!!

You can also show these videos....

A real story - http://www.youtube.com/watch?v=2YGjz5SV_Qk&feature=related
Cyber-bullying - http://www.youtube.com/watch?v=-5PZ_Bh-M6o&feature=related

There is a film comprehension lesson on bullying here:
http://film-english.com/2011/04/06/bullying-lesson-plan/

I think it sounds like an effective lesson, but I'm wondering how it would go down at school seeing as it includes a) bad language and b) animated suicide (!).

Thoughts, anyone?