Phil Ivey, the master of the stone face, had huge tells in a hand against Phil Hellmuth last year.
Surest sign that someone has a big hand: They stop their routine. If someone who has been sitting quietly at a table for two hours suddenly perks up, they have a huge hand. Ivey was being uncharacteristically chatty and jovial in the game and when he saw a raise to him, looked at his cards and got deadly quiet and serious.
Look around 10:13 mark here
Also note that Tom Dwan knew exactly where Ivey was and offers him $2k to show Jacks or better.
This season has been noteworthy for several tells:
Ruffin acts out of turn in 3-betting the flop with a set.
Vanessa Selbst looked like she wanted to cry when trying to bluff Viffer.
Viffer miscut then corrected his chips when trying a huge bluff against Ruffin.