We build software. When building software, one has to make sure the software will work on the full range of potential end-user machines, from fancy-and-new to crappy-and-old. To test the crappy-and-old, we have Doofus, the crappiest oldest computer we could scrounge up:
And of course, a computer named Doofus ought to have a big yellow dunce cap and ridiculously oversized ears. Doofus—so doofy.
1 I just made up that folksy metaphor. I'm not sure how legitimate it is. I suspsect a sloth in barrel of molasses actually wouldn't do any running at all. But you know what I mean.