CHICAGO – A Chicago elementary school teacher allegedly ran a car off the road and impersonated a police officer – to perhaps the worst person imaginable.

West Ridge Elementary teacher Mark Kelley forced another car off the road in Chicago on Thursday, according to Assistant State’s Attorney Erin Antonietti.

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When Kelley got out of his car, he yelled “I am a police officer from Wisconsin, and I am going to f— you up,” according to a police report, DNAinfo reports.

Kelley snapped several photos of the victim’s car and drove off.

His mistake? The target of Kelley’s aggression was an off-duty police officer.

After flagged down a police car, the officer was able to ID Kelley, who allegedly had “a knit cap, glasses and a CPS paycheck” in his car.

The teacher was charged with felony impersonation of a police officer and misdemeanor aggravated assault with a deadly weapon after allegedly using his car to force the other vehicle off the road.

Judge Laura Sullivan ordered a $10,000 I-bond for Kelley, “meaning he can go home to await his next court date,” Red Eye Chicago reports.

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It’s unclear whether he will return to the classroom Monday.