On the new season of the PBS children's series, debuting Aug. 14, fans of 'Mister Rogers' Neighborhood' will recognize the latest addition to the cast.

Daniel Tiger's Neighborhood. Daniel Wants to Ride Trolley. Clip: Season 2 | 2m 24s Video has Closed Captions | CC. When Daniel can't ride Trolley, he stomps three times to let his mad feelings out.

The trolley problem, specifically the particular crude illustration constantly being remixed, has been floating around the web for a while (crowdsourced encyclopedia Know Your Meme traces it to ...