This is Sally Cruikshank, who did a bunch of independently made cartoons back in the '70s and '80s, and has put them all up on YouTube. Some are freestanding cartoons like "Quasi at the Quackadero", and some are segments made for Sesame Street. Check out her weird style!
Flippy Cat's owner makes domino-tipping courses, and sometimes lets Flippy knock over the first domino. Fun stuff!