The line comes from Dr. Steve Brule, the dimwitted public-access health guru played by John C. Reilly and created by Tim Heidecker and Eric Wareheim. Brule first appeared on Tim and Eric Awesome Show, Great Job! before headlining Check It Out! with Dr. Steve Brule on Adult Swim, where his earnest advice segments and his 'For your health!' catchphrase made him a cult favorite. Fans lifted the Sandy's-a-witch accusation onto soundboards and into meme edits, where it survives as a deadpan reaction clip for pinning ridiculous blame on friends and pets.