Bill S. Preston and Theodore Logan, 'Bill & Ted's Excellent Adventure' (1989)
These time-traveling slackers don't smoke weed, don't surf, and barely know how to shred on an electric guitar — yet they encompass all the stereotypes imbued to said dimwitted recreational personae. It's not a bad thing; Bill and Ted stand apart from other movie dum-dums by not having a negative impact on the world around them. They just speak slowly and utter "whoooa!" all the time. These guys don't know much. (Their reference point for the Old West is Disney's Frontierland.) They don't overthink experiences — heck, they can't overthink them. But why Bill and Ted may be literal airheads, give them some credit: They're trying to fill that void with something! These not-so-bright San Dimas High students are self-aware enough to identify with a Socrates quote they dig up in an encyclopedia: "The only true wisdom is in knowing you know nothing."
Dumb Factor: 2