|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".|
|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.|
There are two variations of this skit, one featuring the announcer at the beginning and kid's voices saying "Danger", while another version has all dialouge muted.
VideoSesame Street Professor TV Open & Closed(01:42)