In the '80s, I was the only game in town, I was the only one getting that kind of exposure in any rotation on MTV. Now with internet culture it seems like everyone is doing music parodies. And they're not all good!
I start with a comprehensive list of all the recent songs that have been big hits - and then I go down that list and see if I can come up with funny ideas for them. I can always come up with ideas, but not necessarily good ones!