* TearJerker: Wheatley reduced to a near-suicidal depression in the middle of the story. Seeing the normally upbeat and talkative robot-turned-cyborg in such a state is rather heartbreaking.
** [=GLaDOS=] torturing Wheatley by [[spoiler: showing him clips of HAL (Which fuels his guilt regarding his former FaceHeelTurn) but replacing the audio with Wheatley's voice when he was evil and making it so that any pain he feels Chell will feel as well]]. It doesn't take long for Wheatley to be reduced into nearly incoherent sobs.
** [[spoiler:Wheatley's DisneyDeath]] and Chell's reaction to it.