Computers are down; what's in your bag of tricks for teaching CS when they can't get on a computer? I'm guessing everyone here, high school teachers at least, have spent at least one period in the past year working with a class when you either don't have working computers or a working internet connection.

So what are you go to activities when the computers aren't working?

I've got a couple, but am curious what I'm missing.

Worksheets - I use 'em, but I don't really like 'em. I do keep a set of worksheets printed though just in case nothing is working. They're generic enough that it really doesn't matter what topic we're on. And they work well for emergency sub plans.

CS Unplugged - I 've got the count the dots activity printed out. One set on normal sized paper for me to demo with and a dozen sets printed on business cards for students to practice with. 

Human Sorting - I line up the kids and we go over sorting algorithms. 

I'm sure I'm missing some really good ideas. Let's hear them...
There are lots of great activities at CS Unplugged that do not require a computer. Excellent activities in their own right, you don't have to wait for the days when systems are out. Well worth exploring these resources.

This resource is provided by the Computer Science Department at the University of Canterbury, New Zealand, and shared under Creative Commons BY-NC-SA 4.0 licence.