Act of mischief

Bullying

• Terror gripped his whole being as the bullies approached him with their signature roguish smirks.
• On hearing the thundering footsteps of approaching menace, the poor boy broke into a brisk walk.
• The notorious bullies cornered the poor boy at a secluded spot.
• The threatening glares of the bully caused the girl to break out in cold sweat. 
• The discipline master unleashed a terse lecture at the bullies' obnoxious behavior. 
• With arms crossed in front of his barrel chest, the man demanded in a nasal whine that belied his built.
• My heartbeat quickened as I stepped foot in the deserted school building, where the notorious boys are waiting for me.
• The obnoxious bullies snickered rambunctiously as they leered at the poor boy who fell victim to their mischief. 

Vandalism

• Traces of the misdemeanor were evidently visible in the classroom walls that were filled with unsightly graffiti. 
• The discipline master interrogated the class succinctly in a grave tone but none of the culprits owned up, 
• The two boys were wielding the brushes like swords, slashing them against the originally white-washed wall.
• Throwing all caution to the wind, the boy started drawing haphazardly across the walls.
• The mischievous kids began vandalizing the seats on the bus haughtily with penknives.