Here are some cracker jokes to slip in to those crackers at christmas to make them a bit more of a computing cracker.
Q Imagine you are in a locked room with 100 killer robots wearing Santa costumes. How do you get out?
A Just stop imagining!
There are 10 types of people: those who understand binary, and those who don’t.
Watched by a computer scientist, a biologist and a mathematician, a man and woman enter a house. A little later they see three people come out. The two scientists are each puzzled for a while but then the biologist, suddenly looks really happy and, exclaims “They must have reproduced”. The Computer Scientist, also looking pleased with herself, says “Ahh! there was a bug in the original counting algorithm – an initialization error”. The mathematician, however, has been unperturbed by the whole thing and just remarks “If another person goes into the house, then the house will be empty.”
Two bits walked into an expensive bar, but were thrown out because they didn’t have enough for a byte.
There are 10 types of people: those who understand binary, those who don’t and those who count from 0.
An SQL query goes into a bar, walks up to two tables and asks, “Can I join you?”
[“hip”,”hip”]
– hip hip array!
There are 10 types of people: those who understand binary, those who don’t and those who didn’t expect this joke to be in ternary.
Teaching London Computing: A RESOURCE HUB from CAS LONDON & CS4FN 
Now is definitely the right time to be replaced by a robot.