It's Alicia's 21st birthday. She and her friend group are all "officially adults", so to celebrate, they throw a party to reminisce on their childhood. However, they soon learn through childish traditions that they aren't as mature as they seem.
1983
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2018
2006
2023
2020
2008
2005
1980
2009
2021
2022
2014
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2016
1987
2019
