"Mister Rogers is frustrated that he got a parking ticket, and he opens the show with an unhappy mood, definitely flying in the face of Fred's good nature. Not to mention he didn't even change into his sweater and sneakers as per usual. But it just goes to show that even the kindest and gentlest of people like Mister Rogers can get angry sometimes." - Baby Lamb Creations.

At first I thought that was simply a manipulated clip. I then looked through the footage from the referenced episode (#1210, an episode about managing one's frustration that aired on March 10, 1972) and, well, it was there all right.

Cited my music and social skills teacher Gale Quackenbush on Facebook, "Who knew? He got his lesson point across 'what do you do when you get angry?'"