Last August I mentioned some developer jokes. Here are some more that I've heard from various places (I'm retelling these from memory):
"There are 10 kinds of people in this world - those who know binary and those who do not."
The value of knowledge
Bob had worked 30 years in the engineering department, only to retire a few months ago. As luck would have it, one of the main systems broke down, and a desperate manager eventually tracked Bob down, calling him back in. He poked around the system for 10 minutes, and then flipped a single switch, and everything started working again. As he walked out, he scribbled his fee on a sheet of paper: "Total $10,050: That's $50 for the time, and $10,000 for knowing what switch to flip."
Explaining technical concepts
A sharp college student was interviewing with an average technical company. The student was getting bored with the trivialness of the questions. After 20 minutes, the recruiter, looking down at the checklist, asked "So, can you tell me what is polymorphism?"
"No problem," the ace student replied, "that's just the ability to define multiple classes with functionally different, yet identically named methods or properties that can be used interchangeably by client code at run time."
"Um," replied the recruiter, a little surprised, "now can you describe that in terms a manager would understand?"
"Sure," responded the bored student, "it's magic."