For Your Next Prop Bet
Tehan explained that there is a possible scenario in hold'em in which given a particular board, there are two hands where one can be ahead on the turn, but if one's opponent is holding the other hand, one cannot possibly have the lead after the river comes.
Several expressed doubt, but Tehan had the answer. The board must read 3-3-4-4 rainbow. If one has 7-2 and one's opponent has 6-5, one leads on the turn.
But every single possible river card either gives the hand to one's opponent or creates a split pot. Think about it.