A change of key or at least a chord progression that's stronger and more straightforward than the rest of the song helps. Also, it's good to make the words not zip right by, but make them stand out mostly out the downbeats so as to emphasize them rhythmically more. Something that a whole room full of people could sing at once without blurring eachother's words out much. Tiptoe and traipse through the rest of the song if you want, but for the chorus it's usually better to march or even stomp.
I just can't get you out of my head, more than love if you....(something like that)