Bill & Ted’s Excellent Adventure is a time-travel comedy starring Keanu Reeves and Alex Winter as two high-school slackers tasked with saving their future through history. Guided by George Carlin as the mysterious Rufus, the duo travel across time to collect historical figures for a school presentation. The film became a defining late-80s cult comedy, blending absurd humor with playful science fiction concepts.

Från IMDB:
Two rock-'n-rolling teens, on the verge of failing their class, set out on a quest to make the ultimate school history report after being presented with a time machine.