Answer: Cookie Monster
Aside from his blue fur, which matches IBM's blue corporate colors, it's easy to assume that there was little connection between Muffet Cookie Monster and Sesame Street's giant computer company. In the 1960s, Jim Henson was commissioned to create a training video for Big Blue. To this end, he lent his voice and his Muppets and brought out a prototype Cookie Monster Muppet.
A year ago, when IBM commissioned him to create a training movie, Henson was hired by General Foods to create a set of commercials focused on monsters craving food. He made three unique muppets for three different crunchy snacks, but the commercials were scrapped before the broadcast. The hungry monsters were put on the shelf, but they did not have to wait long before they saw more action in front of the camera.
When it was time to produce the video for IBM, Henson drew the early version of Cookie Monster as a confused and destructive end-user. In the educational film titled Coffee Break Machine focusing on the importance of design and user interfaces, Cookie Monster becomes frustrated with the complexity of the coffee machine and eventually devours it with explosive results.
After that, Cookie Monster appeared in a handful of commercials before settling down as a permanent member of the Sesame Street cast.
Courtesy of Jim Henson Productions / IBM.