JarHead413 said:
It's soda.....not pop.=)
And IMO it's not so much the line itself but the delivery. I hate Hayden Christensen.
It's funny because of what Anakin becomes, a man who needs a breathing resperator to keep him alive. I don't know if GL deliberatly put that line in because of its irony (I doubt he was that clever) or if he just happened to put it in the script without realizing the irony of it, I don't think he had humor in mind with that line.