@Cyclone_Baroness:
Honestly. The crying thing makes more sense than awakening saiyan instincts. What does that even mean? Is this common? Do saiyans have an instinctual trigger? And how was it Kakkarot's power? Wasn't it stated over and over that Goku was an average baby?
It was Kakarot's power when he meets Broly, not when he was a baby. When Goku meets Broly (as an adult), Goku is the strongest being of the universe (or one of the strongest).
It has been demonstrated time and time again that saiyans crave and live for challenges and to fight strong opponents. It's part of them, a tendency or an instinct. Goku himself has put Earth on potential danger several times because of that (by letting Piccolo go, by letting Vegeta live, by trying to let Freeza go, etc). So, Goku's power stimulating Broly's instincts makes perfect sense to me and is perfectly consistent with what we know of the saiyans.
In any case, the point is that the movie actually states that explanation.
@Robby:
Aside from the flashback, Broccoli mentally breaking down to saying only Goku's name, and movie 10?
Broly only breaks down to that state in movie 10. He doesn't break down in movie 8.
By movie 10, Broly had been frozen and comatose with very serious injuries for years which have left him unstable and obsessed with the man that defeated him and caused him that much pain.
Although the movie suggests that Broly has managed to remember baby Goku thanks to the very similar cry of Goten, nothing suggests that Broly is focused on Goku in that fashion because of the cry and not because Goku punched a hole in his chest, nearly killed him and caused him to be frozen and comatose for years.
The very end of the film when Goku punches Broccoli in the chest to kill him, Broccoli flashes back to the crying baby Goku, and in turn, Goku's crying as an infant upsetting him.
That is talked about in the topic I linked to. Here:
"However, besides that, we also get two unknown guys in the flashback commenting on Broly and Goku as babies, and this is what they have to say:
"I'm shocked by Paragus's son. He's just been born and yet his power level is already 10.000." "Bardock's son with a power level of only 2, made Paragus' son cry!" "His power level may be low but that kid at least has guts!"
So, what can we take from these statements? They seem to stress the difference in their power and how Goku was still able to affect Broly despite of this. But can we take from these statements that Goku's crying played a part on Broly's reaction despite what Paragus said and his expositional lines? What are the point of these statements if not?
I believe the movie answers this question 1 hour, 8 minutes and 24 seconds into the movie when Broly is being defeated by Goku and the crying flashback, once again, is played. It seems to be at this moment that the statements made by those two unknown guys gain meaning. As they said, baby Goku was much weaker than baby Broly, but he still found a way to disturb him with his cry. And isn't that basically what happened in the fight in the movie? Goku was much weaker, but he still found a way to disturb and beat Broly, by cumulating the power of his friends with his own and striking back.
The guys that made this movie chose to repeat that flashback as Broly was being defeated and I see no other plausible justification for that than giving meaning to the words of those two unkowns. That means that the crying flashback works as foreshadowing and a metaphor for the fight between Broly and Goku, and not as the cause for Broly's actions towards Goku. Even though it's possible to interpret the flashback in that way, the statements of those two unknowns don't say or imply by themselves that Broly remembers Goku or that he became crazy due to Goku's crying, and in conjunction with the rest of the movie, namely the repetition of the flashback as Broly is being defeated, I am forced to conclude that those statements are not an indication that Broly remembers Goku or that Goku's crying made Broly mad."