God is kind. He has promised that humanity will forever flourish. Over time, an infinity of people will live.
Satan is cruel. He is going to torture infinitely many of those people. And crueler still, he has charged you with choosing which ones he will torture. You have three choices:
(1) Satan will torture everyone born on a Monday after January 1st 2012.
(2) Satan will torture everyone born on a Wednesday after January 3rd 2012.
(3) Satan will torture everyone born on a Monday after January 8th 2012.
Each victim will suffer the same amount of pain, and that amount will be the same whatever your choice.
Here is the paradox:
(1) is no worse than (2), as these choices apparently concern equal sets of people being tortured equally. Similarly, (2) is no worse than (3).
So it follows that (1) is no worse than (3).
But this is obviously false, since in case (1), all the same people are tortured as in case (3) and others as well. Contradiction.