Al's Brain

'Weird Al' Yankovic

Self / Phineas Gage

Billy West

Norm the Owl / Billy the Brain

Tim Heidecker

Brain Stretcher

Eric Wareheim

Brain Stretcher

Patton Oswalt

Co-Worker

Thomas Lennon

Co-Worker

Paul McCartney

Man on the Street

Fabio

Man on the Street

Bob Bancroft

Norm Kozlovsky

Michael William Arnold

Timmy

Ezra Buzzington

Homeless Guy