We present four new changing-look quasars from
SDSS found serendipitously by two methods: (1)
targeting objects with large-amplitude brightening in
Pan-STARRS, and (2) mining Stripe 82 for
extremely variable quasars with repeat SDSS
+BOSS spectroscopy. Changing-look AGN may
provide a unique probe into the physics of accretion
and BLR structure.