Here's when I saw that LeBron is human. Not the fall after the dunk. It was at the timeout just after The Block. They had a floor level shot as the Cavs were settling into their seats, and you caught just a glimpse of LeBron's face, partially obscured by another player, as he dropped into his seat, . And he was SPENT. For just a second you saw the painful exhaustion on his face.
Watch it. It's at the very end of this 30 second clip: