Heavy Metal BRIAN POSEHN To Guest On ‘Jimmy Fallon’ Tonight April 26, 2010 Atomm Leave a comment Comedian/actor Brian Posehn will appear on NBC-TV’s “Late Night With Jimmy Fallon” tonight (Monday, April 26).Source Comedian/actor Brian Posehn will appear on NBC-TV’s “Late Night With Jimmy Fallon” tonight (Monday, April 26).Source