I found a great parody of Hey There Delilah called Hey There Chlamydia on youtube. The video seems to portray mostly accurate information, except in one part where it is referred to as a 'nasty STD'. Chlamydia is actually a bacterial infection and is classified as an STI because it is curable. It was correct however when it states "it burns when I go pee". Burning during urination is an actual symptom of Chlamydia.
This video is definitely aiming at a an age group of about 16-25 or anyone that has access to youtube and listens to this certain genre of music. Because this is somewhat of a 'girl song' it is targeting the people at the highest risk for Chlamydia: teenage women.
I think using humor is somewhat of an effective way of reaching people and raising awareness of the STI, however a lot of people may not take it seriously since it is just a parody. Many people laugh it off and don't actually think about what it says. Fear is not really used much in this video because it is overcome by the humor.
I do think it has good messages though. It talks about how he should have used protection and that he does now. It also states how he should have got her name. Knowing your partner and communicating with them is a great way to prevent STDs and STIs.
Here's another video I found just for fun! Pretty funny condom commercial from Argentina.
http://www.youtube.com/watch?v=Rcc-QDGCfU
