Saved by the Bell Season 1 Episode 9 All in the Hall

Zack, Screech, and Slater all have a huge poker game planned in the hallway during school hours, but when Mr. Belding catches them, they're all given detention. Meanwhile, Lisa's limited edition "Textiles of Navajo" jacket goes missing, and she suspects that the new school janitor, Nick, may be responsible for stealing it. When Jessie tries to clear Nick's name, she ends up getting in a heated argument with Lisa about stereotypes and assumptions. As the detention goes on, the boys start to worry that they might miss their big poker game, so they come up with a plan to escape and finish the game. However, as they sneak around the school, they accidentally uncover the truth about Lisa's missing jacket and must decide whether to reveal what they know or keep it a secret. In the end, everyone learns important lessons about honesty and assumptions.