https://www.tumblr.com/amriagaelraincaller/751480045533528064/people-wonder-why-i-draw-so-much-thousand-sons-art?source=share
"When Guilliman was five years old, he smashed the door to his study( which was crafted from bronze and weighing at least three tons) in a fit of rage. It was the only time Tarasha Euten pulled his ear and made him stand facing the wall."