Zig Zagged: Bevis almost gets hit by a car, but the car stops. What does hit him is the baseball that rolls off the roof of a nearby building. But it turns it to be autographed, and worth thousands of dollars! Then he trips and falls down a hill. Into a river. But he finds a gold ring in the bottom of the stream! So he goes to the pawn shop... and gets mauled by a bear on the way.
Averted: Bevis T. Monkey is not particularly unlucky, nor is he especially lucky.
Enforced: The creators needed comedy relief so they created Bevis
Lampshaded: “Why do these bad things keep happening to me?”
Invoked: "I'm bored let's go pick on Bevis T. Monkey because that's always good for a laugh."
Discussed: "Is it just me or does God seem to hate Bevis T. Monkey?"
Conversed: "Maybe we should cut Monkey some slack." Beat "Naaaaaahhhh..."
The constant unluckiness kept bothering Bevis with increasing levels of misfortune to the point of breakage.
One day, Bevis gets a shotgun and, without hesitating, starts to chase the people who makes his life hell, killing them mercilessy.
All the abuse Bevis goes through causes him to become very bitter and cynical to the point where he's afraid of being happy lest something bad happens as a result. Whenever anything goes his way, he becomes paranoid that its merely a set up for him to be knocked down in an exceptionally cruel way.
Alternatively, in spite of all his bad luck, Bevis is The Stoic or manages to keep a Stiff Upper Lip. Due to this mentality, he never sees his bad luck as anything more than a bother or annoyance (even if logic says he really should). His low key reaction to the bad stuff that happens to him only serves to enhance the comedy.