No but really. In his first appearance, he made a contract with Hella Jeff to hide his socks and thus create a diversion for Hella Jeff's next evil ploy, which was, as we know, the procuring of the car. However Geromy quickly went against his word and directs Hella Jeff, who is backing up in the car, into a lake. Hella Jeff understands the treachery of this most foul of adversaries, the Prince of Lies, Master and Lord of Deceit. He barely escapes with his life, and goes on to become a respectable churchgoer.
Geromy's second act of evil is at Christmas. Sweet Bro and Hella Jeff merely wish to celebrate the birth of our Lord Jesus Christ, but Geromy attempts to stop the festivities by blocking the chimney, thus preventing Santa Claus from delivering presents for everyone.
Geromy is also seen at the supermarket, lying in wait for Sweet Bro. When Sweet Bro arrives, Geromy clouds his judgement and causes Sweet Bro to lash out, forcing the noble police to step in. It is then revealed that Hella Jeff may have had something to do with this act.
When Sweet Bro and Hella Jeff visit the zoo, Geromy can be seen commanding an evil spirit taking the form of a giraffe.
Geromy also might have granted Sweet Bro the power of flight. This is shown when Geromy can be spotted in the strip where Sweet Bro takes to the sky atop a skateboard. In that same strip, Geromy tempts Hella Jeff with a beautiful woman. Ironically, Sweet Bro's newfound power ends up causing his death later on. Geromy did not lift a finger to try and help prevent this accident, or discourage Hella Jeff from the fatal prank.