One reason could be that Lupis's actions had negative consequences for Ainz or their associated group. If Lupis's deeds led to losses, whether it was of resources, reputation, or something else, Ainz might yell at her out of anger and disappointment.
In many light novels, characters often have complex relationships. Ainz yelling at Lupis might be related to a power struggle. If Lupis was trying to assert herself in a way that Ainz saw as a threat to his leadership or plans, that could be a reason. Or perhaps Lupis accidentally revealed some secrets that Ainz wanted to keep hidden, and his yelling was a reaction to that.
It could be that he's trying to get someone's attention or express his frustration. Sometimes, characters in cartoons yell for all sorts of reasons related to the plot or to create drama.
Maybe he yells to intimidate villains or show his determination.
In some fanfictions, Snape might yell at Draco because he expects more from him. Draco is from a prominent pure - blood family, and Snape, being strict, wants Draco to uphold certain standards. Maybe Draco made a mistake in potions class, or he showed disrespect towards other students. Snape's yelling could also be a way to protect Draco from getting into more serious trouble in the dangerous Hogwarts environment.
In fanfictions, Draco may yell at Harry due to jealousy. Harry is often the center of attention and gets all the glory. Draco, who comes from a proud pure - blood family, might feel overshadowed and this could lead to him yelling in frustration.
He might yell because he is startled by the strange things around him in the story.
The woman might be yelling at the man because he broke a promise or did something that was unexpected and upsetting. Cartoons often use such scenes to create drama and entertainment.
Maybe the kid did something naughty or disobedient that made the mom lose her temper.
It could be that the mom is having a bad day and is taking it out on the kid. Or perhaps the kid didn't follow the rules and the mom is trying to teach a lesson.
It could be that in the cartoon's storyline, the word 'balls' is a trigger for some kind of action or reaction for the dog. Maybe it's part of a game or a funny situation.