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Jennifer Garner shared a hilarious video of her talking about "Hamilton." Pictured: Garner attends Premiere Of Summit Entertainment's "Draft Day" at Regency Bruin Theatre on April 7, 2014 in Los Angeles. Getty Images/Michael Buckner

Jennifer Garner has a lot of emotions when watching "Hamilton," especially when she's inhaled some laughing gas.

On Thursday, the actress shared a hilarious video of herself on Instagram talking to someone over the phone. Garner, who is in her car in the clip, cried and laughed over "Hamilton" at the same time. "Throwback Thursday-- that time I had dental anesthesia...laughing gas + novocaine + Hamilton = you're welcome. #TBT @hamiltonmusical," she wrote in the caption.

"They did the sad part of Hamilton and I started crying, I couldn't stop," Garner, 45, said. "They said, 'Are you OK?' And I said, 'It's so beautiful.' It was so beautiful, that music. It was so pretty. And so I told them about it, they have to see it."

Garner joined Instagram earlier this month, and since then, she has been showing support for the Save the Children charity's Hurricane Harvey Children's Relief Fund. In her posts, the "Miracles from Heaven" star urged her followers to donate to the organization for the victims of the tropical storm.

Last week, Garner flew to Texas to meet the children who were affected by Hurricane Harvey. She helped the Save the Children organization distribute donations to families with children.

Garner then shared her emotional encounter with the kids on Instagram. "Today I was inspired by the huge hearts in Texas. There is a generosity of spirit that gets lost in political rhetoric, but-- people come together in a time of crisis," Garner wrote. "You know what's beautiful? Children look for light. "

According to Garner, the children she met were very inspiring. Despite their terrible experience, they didn't dwell on the hardship they went through. Instead, they talked about the good things that happened to them after the storm. They shared how their neighbor's dog was found, how they saved their mom during the flood and how they celebrated when the power came back on. "We have to protect our kids and we have to learn from them," Ben Affleck's estranged wife added.

Just like Garner, Affleck is also into charity work. In fact, the "Justice League" star accepted a humanitarian award in July at the Starkey Hearing Foundation Gala in St. Paul, Minnesota for his dedication to the nonprofit organization Eastern Congo Initiative. However, the recognition did not impress his eldest daughter, Violet, when he informed her because her mom, Garner, had already received the same award.

What do you think of Garner's latest Instagram post? Drop a comment below.