During the filming of Season 1, Episode 5 ("The One with the East German Laundry Detergent"), director David Schwimmer famously pranked Jennifer Aniston by throwing a dummy down the stairs. "Zoey 101" Prank Week (TV Episode 2005) - IMDb
In Season 1, Episode 5, Isaac pulls an extreme "practical joke" on Gordon by amputating his leg while he sleeps. [S1E5] Prank Week
To save her fellow female students from mass expulsion, Zoey takes sole responsibility for the prank. She agrees to accept an immediate expulsion and issue a public apology to the entire school. During the filming of Season 1, Episode 5
PCA Prank Week, where students engage in competitive practical jokes. During the filming of Season 1