Head Smacks

Season One:
The Curse (5): Gibbs smacks DiNozzo
Left For Dead (10): Gibbs smacks DiNozzo
UnSEALed (18): DiNozzo smacks McGee; Gibbs smacks DiNozzo
Split Decision (21): Gibbs smacks DiNozzo
Reveille (23): Todd smacks DiNozzo

Season Two:
See No Evil (24): Todd and DiNozzo slap McGee on the head at the same time.
Lt. Jane Doe (27): Gibbs thumps DiNozzo on the head.
The Bone Yard (28): Todd throws McGee around the Gym and Gibbs slaps Dinozzo softly on the face. Todd asks Gibbs if he is looking for a reason to smack a character in the head. Dinozzo smacks McGee on the head. Gibbs smacks DiNozzo on the head. DiNozzo smacks McGee on the head.
Doppelganger (35): Lt. Cheney (a Gibbs clone) smacks Detective Monteleone ( a DiNozzo clone) on the head as Monteleone flirts with Todd. The Monteleone smacks Detective Miller ( a McGee clone) on the head as they get in their car. Gibbs smacks McGee on the head. Gibbs smacks DiNozzo on the head.
Witness (37): Gibbs smacks DiNozzo on the head.
Caught On Tape (38): DiNozzo smacks McGee on the head. Gibbs smacks DiNozzo on the head with a remote. DiNozzo starts to smack McGee on the head but stops because of McGee's rash.
An Eye For An Eye (40): Gibbs smacks DiNozzo on the head.
Hometown Hero (44): DiNozzo smacks Palmer on the head.
SWAK (45): Gibbs smacks DiNozzo in the head. Gibbs smacks McGee on the head. Gibbs smacks DiNozzo on the head in the isolation room.
Twilight (46): Gibbs smacks DiNozzo on the head.

Season Three:
Kill Ari (Part 1) (47): Abby and DiNozzo smack McGee on the head at the same time. Gibbs smacks DiNozzo on the head. Abby smacks McGee on the head again. Gibbs smacks DiNozzo on the head again.
Mind Games (49): Gibbs smacks DiNozzo on the head. DiNozzo smacks McGee on the head.
Silver Wars (50): Gibbs hits DiNozzo in the head with a paper ball. (Not counted) Gibbs hits David in the back of the head after their elevator conference. Gibbs smacks DiNozzo on the head.
Switch (51): Gibbs snaps DiNozzo on the forehead with his fingers.
The Voyeur's Web (52): Gibbs smacks DiNozzo on the head.
Frame Up (55): Gibbs smacks DiNozzo on the head. Gibbs smacks DiNozzo on the back of the head through DiNozzo's jail cell bars.
Probie (56): Gibbs tells David to smack DiNozzo and she does. Later DiNozzo tells David " You ever Gibbs-smack me again David and I will slap you back harder."
Model Behavior (57): Gibbs smacks DiNozzo in the head.
Boxed In (58): Gibbs smacks McGee on the head
Deception (59): Gibbs smack David and DiNozzo on the head at the same time.
Light Sleeper (60): Gibbs smacks McGee on the head. Gibbs smacks DiNozzo on the head. DiNozzo smacks McGee on the head.
Head Case (61): DiNozzo smacks himself on the back of the head. Gibbs smacks DiNozzo and McGee on the head at the same time.
Family Secret (62): Gibbs smacks DiNozzo on the head, then he smacks David on the head. Gibbs smacks himself on the head.
Bait (64): DiNozzo smacks McGee on the head.
Iced (65): Gibbs "pets" DiNozzo on the back of the head. gibbs smacks DiNozzo on the head.
Untouchable (66): Gibbs smacks DiNozzo on the back of the head. Gibbs smacks DiNozzo on the head again.
Bloodbath (67): Gibbs smacks DiNozzo on the head.
Jeopardy (68): Gibbs smacks DiNozzo on the head.
Hiatus (Part 2) (70): Franks smacks Gibbs on the head in a flashback. David takes Gibbs's hand and smacks herself in the back of the head with it. Gibbs remembers smacking her in a flashback. Gibbs smacks DiNozzo on the head.

Season Four:
Shalom (71): DiNozzo smacks McGee on the head. McGee smacks himself on the head. Gibbs smacks DiNozzo on the back of the head with a cell phone.
Witch Hunt (76): DiNozzo smacks McGee on the head. Gibbs smacked DiNozzo and McGee on the head simultaneously when they got distracted by Abby dressed as Marilyn.
Twisted Sister (79): Gibbs smacks McGee on the head after McGee tries to quit.
Smoked (80): Gibbs smacks DiNozzo on the head.
Driven (81): DiNozzo smacks McGee on the back of the head, McGee smacks DiNozzo back on the leg. DiNozzo smacks McGee on the back of the head again.

Slapper                                                           Slapee
Gibbs 48                                                         DiNozzo 38
DiNozzo 14                                                    McGee 23 (1 himself)
Todd 2                                                           Detective Monteleone 1
Lt. Cheney 1                                                   Detective Miller 1
Detective Monteleone 1                                  Palmer 1
Abby 2                                                           David 5
David 1                                                          Gibbs 2 (1 himself)
Franks 1
McGee 1 (himself)


There is a "Hit the head montage" on disc 3 of Season Three.