When you watch Doctor Who with a 5-year-old

The Sontarans are a warrior culture. They reproduce by cloning.

"What's a clone?"
I can handle this question.

They prepare for battle. Sontar-ha! Sontar-ha!
"Why are they chanting?"
"Mommy, what's war?"
"Why is there war?"
"Why are you crying, Mommy?"