Watch as eighteen-month-old fraternal twin boys Sam and Ren converse in a heated debate about something we mere older people will never comprehend. This week the video pasted above has gone viral, and after you mash play you’ll no longer wonder why. But how is this da-da-da conversation taking place? Listen to what the experts have to say.

According to Stephen Camarata, professor of hearing and speech, “These kids are right on the cusp of language. They’re using the intonation patterns of sentences — imitating sentences in a crude way. It’s one way that children learn how to talk.” Adds Dr. Roberta Golinkoff, education professor and director of the infant language project at the University of Delaware: “Even before they have words, they know how conversation work. They’re producing syllables emphatically and using them for communication purposes. They’re having a ball.”

Crazy huh?

[Via ABC News]