I really like parodies. I have my Weird Al favourites, and I've had a few goes at trying to write my own song parodies in the last couple of years.
Below are two examples, both co-written works, because I have yet to develop a talent for parodying an entire song to any coherence, though occaisonally I am good for a line or two.
The Phantom of Les Miss Saigon
The musical parody co-written by Fred Nerk and I; now with masks, drug dealers, exotic dancers, unrequited love, unplanned pregnancies, tragic deaths and catchy melodies. What else can you ask for? (Wait, no, don't answer that.) It comes with a little background knowledge as to how this whole madness began.
Red and Black
A (slightly rude) parody of Red and Black from Les Miserables, born out of a misheard lyric by one Fred Nerk. She confessed it to me one night, probably while we were drinking coffee liberally doused with Kahlua, for this was the result - written in several fits of giggles by said Fred Nerk and I.