Now, this is not holdem related, but the backroom I used to play in a little over 2 decades ago had some folks who played for big money. Several of the folks there had made and lost small fortunes at the game. We were playing 5 card draw and the most experienced guy drew 2 cards. He looked at what he got and his eyes bulged and he said a couple of words not repeatable here. We all folded. He had gotten only his second royal flush in his life.
The moral of the story, emotions happen. You never know when some issues will cause you to have a tell come out. This means that no matter how calm and collected you are, at some point, you might just cause all sorts of actions from the others you are playing with.
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