WATCH: Stanford welcomes UCLA's Rosen to rivalry with pick-six on first drive

Welcome to the Pac-12, rook. 

On UCLA's first possession against Stanford on Thursday night in Palo Alto, QB Josh Rosen tried to throw down the field on the Cardinal defense. It didn't work out well for the youngster.

Stanford's Alijah Holder snatched Rosen's pass out of the air and made a fantastic run to the end zone for the first touchdown of the night. 

The interception was only the second of the season for Stanford.