Slips and falls on the set approaching the front door.
Hand is severely burned when he places it on the boiling-hot doorknob (which comes from a charcoal BBQ starter on the other side). Although he puts it out using the snow near the steps, it does inflict a painful permanent scar in the shape of an M.
Has his head burned by a blowtorch when he opens the back door, and again, he puts it out with the snow outside.
Gets covered in glue and feathers, causing him to look like a chicken.
Slip on Kevin's Micro Machines at the foot of the stairs (with Marv)
Gets hit in the face with a paint can while going up the staircase (with Marv)
Falls down after tripping on a wire, knocking him unconscious
Hit by Marv by accident when the latter attempts to kill Buzz's tarantula
Falls with Marv after swinging to a wall while attempting to use a rope to cross to Kevin's tree house due to Kevin cutting the rope with a hedge clipper.
Hit by Old Man Marley with a snow shovel after Kevin's capture
Gets punched across the face by "The Model" after Kevin creates a diversion by pinching her buttocks. (when Kevin blames Harry)
Crushes the roof of a parked car after jumping on a seesaw triggered by Marv.
Harry tries to grab a hold of a ladder which Kevin made all slippery with liquid detergent, causing him to fall to the ground.
A bag of tools falls on him, knocking him unconscious as he kicks open a door.
Head gets burned with a blowtorch again when he tries to turn on a light switch; then he attempts to put it out in a toilet, not knowing that Kevin had filled with paint thinner, almost blows up the pent house, and comes back out with the whole bathroom burned up, along with his head.
Falls from a sawed ladder.
Narrowly misses paint cans swinging on the staircase but gets hit by a pipe and flung to a basement where he is hit again by the same pipe after Kevin cuts the ropes holding it (with Marv)
Crushed by tool chest that falls down over the stairs (with Marv)
Falls with Marv three stories when Kevin ignites the rope they were climbing down on (it was soaked in kerosene) and gets covered from head to toe in varnish.
Showered with Marv by birdseed from the Pigeon Lady, and get covered in pigeons which peck them, and the pigeons' feathers stick to the varnish.
Collides with Alice Ribbons head-on while chasing the toy car through a hedge
Hit on the head by a falling trunk of books and a barbell (with Earl Unger)
Injures himself in an attempt to open a door which was screwed shut by Alex
Sprayed in the eyes with black spray paint.
Gets hit in the crotch by a spring-loaded boxing glove and falls on his gun, causing it to misfire at him . Then steps on a wobble coushin. Falls down a loose plank of boards into the basement and crushes Alice.
Alex scared him with a bubble gun
Injured by an explosion of fireworks in a snow fort.