1. Find some comics and photocopy them so that the word bubbles are big enough to write in. Toss in some classics like Snoopy and some of the odd Manga things that are easily found here in Korea.
2. Write about 25 words on pieces of paper and put them in a bag (use new vocab words, or just silly things like "gorgeous" "banana" "soccer" whatever....) for students to pick.
3. As an intro, you can use the powerpoint that I've uploaded here. I like offereing the kids a visual aid, as well, it lets me guage their response to which comics and cartoons they recognize etc.
4. In groups of two, let the kids write a short conversation in the blank word bubbles, but they must use the two weird words in their conversation.
I haven't tried it yet, I'll let you know how it goes.