I think I just won a game because of an emote.
Playing against a priest in arena, I have a Venture Co, Secrete Keeper, Water Elemental (at 2hp) and Fen Creeper. He's frozen and at 12hp, has a 2/4 3/3 and 2/3 on the table and just hit 10 mana. Earlier in the game he had used Thoughtsteal. He used Pyroblast (1 off in my deck, I hadn't drawn it yet) on my Venture co. I'm emoted I'm sorry. He was then sitting there trying to figure out if he could trade into my Fen Creeper without clearing his board (which he couldn't). I think he assumed my I'm sorry meant I had Pyroblast in hand and had lethal lol. I had 3 cards, all bad, he had 6.