Spoiler (mouse over to view)
When it's found out the mother cheated on the father on her wedding day with their best friend. The fact that the husband figured she did and was okay with it had me screaming at the screen. Like, she was engaged to you before you even met the other guy and you realized they flirted a lot so you're okay when she fucks him and gets impregnated on your wedding day? Wat? The father wasn't as bad, but the mother was an awful person.
For some reason that whole part genuinely pissed me off.