I can't stand parodies. They're funny when you hear them once, then after that they rapidly become unbearable, and they totally destroy the original song, which you can never again hear without the parody sneaking into your head. Once a parody starts becoming popular, it then becomes totally uncool to sing the original, till people get sick of the parody, then the whole song/parody combination vanishes down the plughole never to be heard from again.
Yechhh!
Don't write parodies - write good original songs. They last much longer. (unless they get parodied)
Ray