Halloween Decorations: What's Scary about Computers/Radio?

I’m in the navy, working with computers and radio. We are decorating the passageway outside of our shop with an IT guy with a laptop, moaning “Let me update your computerrrrrr!” and “Your computer is due for updaaaaates!”, creepy ambient noise, white lights turned off (red lights on), and need to decorate the door.

We’re limited on funds, and pretty much can use markers and this big roll of paper we have. What do you think we could do for the door so it is computer-themed and scary?