Making a parody of a popular (and kind of annoying) advertisement is one thing.
Making it into an unexpected joke about something much more involved is another thing entirely.
Check out this hilarious "Anything You Can Do" GAP commercial gag by JoeyandDavid and see what happens when good parodies are lost on bad audiences. It's almost worth losing your pants over… ("Wut! Wut!" to our very own scribegrrrl and Best Week Ever for the tip).