Want to know when Sarah Palin got under Joe Biden's skin? He flashed that high-beam grin or scratched his neck.
Wondering which issues made Palin squirm? Keep an eye on her fast-paced blinks and raised eyebrows.
ABCNews.com asked several body language experts to analyze Thursday night's vice presidential debate -- picking apart every wrinkled nose, winked eye, pointed finger and nuanced voice inflection.
Overall, the experts concluded that Palin's demeanor and gestures showed she started out nervous but quickly gained confidence, even if the Alaska governor's folksy lingo turned off some voters.
Biden's 35-year career in the Senate prepared him well for the debate, during which experts said he seemed more reserved than usual. While declining to attack Palin straight on, the Delaware Democrat restrained himself by putting his hand in his pocket and taking deep breaths.
Patti Wood, an expert in nonverbal communication, said that she counted as many as six winks made by Palin, the first coming just a few minutes into the start of the debate.
While the gesture may seem out of the ordinary for some, Wood said that she thinks Palin's winks were genuine.
"The wink is a natural gesture for her and it works to make the audience feel OK and like we're in this with her and that Palin understands us," said Wood.
Greg Hartley, a former Army interrogator and the author of "I Can Read You Like a Book," agreed that Palin's winks were out of habit.
"Her wink was innate. It's part of her sportslike kind of personality and she's become accustomed to it," said Hartley.
With Biden being careful not to appear condescending, sexist or bullying, the senator succeeded in restraining his often shoot-from-the-hip style of speaking by masking his frustration with a toothy smile or fidgeting.
"Biden showed tremendous restraint. There was no way he was going to attack Palin," said Hartley.
"When Biden smiles in that huge way it's a self-defense method," said Hartley. "It was a way to release [his angry] energy."
Hartley said he noticed Biden put his hand in his pocket several times to calm himself down while Palin was speaking.
"Biden was scratching his nose or neck a lot, which is usually a sign of letting out contained energy," said Hartley.
"Biden was fidgety and really trying to contain himself," said Wood. "When you scratch the back of your neck, it's a precursor to wanting to bring your fist out to punch. That's something bar owners look for -- a sign that a fight is imminent."
But Biden wasn't the only candidate smiling. The experts noted that Palin smirked throughout the debate, an expression that often exudes sarcasm.
"The smirk is Palin's natural smile but it looks sarcastic and people don't respond well to sarcasm," said Hartley.
"She showed snide confidence with her smirk. That's one thing she has to be cautious of," said Hartley.
Wood said that Palin's consistent smile was her way of making sure she didn't appear "shrill."
"The hardest thing for women in this situation is that they have to walk the b- line -- the b-- line," said Wood. "They have to walk a very thin line between being too feminine and being a b--."
"Palin has to hide her anger with a smile every time and that can look really sarcastic and unpleasant," said Wood.