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Tear Jerker: Short Circuit
Johnny Five's apparent demise in the first film. Yes, it's a Disney Death, but still...
Short Circuit 2:
The look on Fred's face when he finally finds Johnny ... and sees the condition he's in. His expression goes from joy to horror in seconds.
The aftermath of Johnny Five's beating by the bank robbers in Short Circuit 2. Also, near the end, when Benjamin tries to revive Johnny Five's battery power with a defibrillator, just after catching Oscar.
During another reading binge at a bookstore, Johnny finds two books that he says he will read "very carefully". After he is arrested by the police, and treated as property rather than a person, he's shown reading one of the books slowly and carefully, rather than flipping through in seconds like he normally does. The two books? Frankenstein and Pinocchio.