Ed, Edd n Eddy (1999)

S3E5 It Came From Outer Ed

Eddy and Edd decide to pull a prank on Ed for some fun. They forcibly pull him from his room while he's engrossed in his new comic, "Evil Tim." However, when their plan flops, Ed comes up with his own scheme. As the episode unfolds, they embark on a series of ridiculous antics based on Ed's idea. Ultimately, it turns out that Ed's scheme isn't about swindling money from anyone; instead, it revolves around creating a curse.