One of our favorite impossibilities in magic has to be the "Any Card at Any Number" plot made popular by David Berglas (and many others). The sheer cosmic unlikelyness of any spectator's thought of card showing up at any spetctor's number (between 1-52) exponentially skyrockets the impossibility of this actually happening.
Your first spectator thinks of a number and shuffles the cards, while your second spectator locks in a thought of card. As you lay the cards down, one by one, they will find the thought of card preciselly in the place of the thought of number.
Titanas, once again, has simplified this miracle and transformed it into into an easy to perform, hard hitting moment that your spectator's won't soon forget.