This one. http://www.youtube.com/watch?v=F0AlcVU-de4 They could also show them Coming to America, the early scene i think..."your royal penis is clean sir...."
I feel that this was completely wasted, cause if they reduce the amount of HIV by just teaching them to be cleaner, they will take away US jobs that are researching cures for HIV, and once a cure is found the sale of very expensive drugs....