Professor Television is a recurring Sesame Street segment, featuring Bill Irwin as the title character. The skits usually involved the professor demonstrating words, which always end in disaster.

Picture	Theme	Earliest known apearance	Description
	Open and Closed	Episode 3656	Professor Television tries to demonstrate open and closed, but his efforts backfire when the door does the opposite of what the sign says. So, he just puts up a sign saying "Nevermind". Video: Bert & Ernie's Word Play (2002, introduction cut, announcer's dialogue muted) Online: Sesamestreet.org (SSvideo) Online: YouTube (YouTube)
	Near and Far	Episode 3683	Professor Television tries to demonstrate near and far, with help from Maria's voice.
	Danger	Episode 3713	Professor Television tries to demonstrate "Danger" by putting a "Danger" sign above a deep drop. The sign falls, however, so he gets a large flashing "Danger" sign, which traps him. Online: Sesamestreet.org (SSvideo)