As I have looked over the many myths that occur in the Greek Mythos I have come to realize that the gods are the type of people who take the comments of mortals way too seriously. Really, because a woman brags your mom that she has more children than her, you and your sister think it is right to go and kill all 14 of the boastful woman's children. Thus I begin to explain the douchebaggery that occurred to Niobe and her children.
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Now from what is gathered Niobe met Apollo and Artemis' mom Leto and made the dumb mistake of boasting superiority over the divine mother since Niobe had 14 kids (7 boys and 7 girls) and Leto had only two. Now in most myths of the Classical world, when someone boasts to deity about something they have, said deity gets pissed and fucks their shit up. So as you will see, Leto didn't take Niobe's comments that well and decided to call her children and teach Niobe a lesson; and that lesson just so happened to be was to kill all the children of Niobe and teach her that you never should fuck with the archer twins mother.
Look who has the most children now bitch!
While the girls of Niobe died a quick painless death, due to Artemis' silver arrows. The boys were not so lucky, for when his golden arrows pierced the sons of Niobe, they suffered a slow and painful death. (Sexist much?) To further add insult to injury, Niobe's husband was killed, either by himself or by Apollo. Now with her family dead Niobe ran up Mount Sipylus and wept until finally Zeus (I believe) turned her into the rock that can still be seen to this day.
Man, all I did was brag that I had more children than Leto and now I'm rock
Next time- Prometheus vs Zeus