Nice catch . And yes, I deliberately "sampled" that synth riff, which actually by the way is really from ABBA's "Gimme Gimme Gimme", which is the riff Madonna sampled in the song you're referring to. It's fully intentional, and I'm glad someone caught it . http://www.youtube.com/watch?v=p6-M63HVR2g 0:18 seconds in. Welcome to the site!