* Many moments.
** This exchange:
-->'''Donnie:''' How does it feel to have a wacko for a son?\\
'''Rose:''' [[spoiler:''It feels wonderful.'']]
* The ending is this completely. The worst part is when [[spoiler:they show Frank at the end of the "Mad World" montage just sitting there. Implying that, seeing as the other people in said montage remembered Donnie in some way, [[CrowningMomentOfHeartwarming he's going to skip Halloween to remember someone he never even knew.]] To top it off, he tried to warn that person and failed]]. Now imagine how you would feel in his shoes.
* This line from Frank.
--> I'm so sorry Donnie.
** This makes sense, as [[spoiler: he is one of the manipulated dead (long story), and is apologiesing in advance for killing Gretchen.]]