Red pill vs. the blue pill.
https://www.youtube.com/watch?v=zE7PKRjrid4
One pill makes you larger And one pill makes you small And the ones that mother gives you Don't do anything at all Go ask Alice When she's ten feet tall And if you go chasing rabbits And you know you're going to fall Tell 'em a hookah-smoking caterpillar Has given you the call Call Alice When she was just small When the men on the chessboard Get up and tell you where to go And you've just had some kind of mushroom And your mind is moving low Go ask Alice I think she'll know When logic and proportion Have fallen sloppy dead And the White Knight is talking backwards And the Red Queen's off with her head Remember what the dormouse said Feed your head Feed your head
Morpheus is indeed offering Neo a choice between a pill that feeds his head, and one that doesn't do anything at all.