[ doorbell rings, dog barks ] oh, that's what blows your mind -- the advanced technology of a doorbell.. [ male announcer ] tweet an expert and schedule a callback from any device. introducing the xfinity my account app. [ female announcer ] f provokes lust. ♪ it elicits pride... incites envy... ♪ ...and unleashes wrath. ♪ temptation comes in many heart-pounding forms. but only one letter. "f". the performance marque from lexus.