Recurring computer nightmares:

• I follow a link to a web page which is supposed to contain some piece of information I’ve been looking for. The page is infinitely long and I start searching for key words while it is loading, they are never there and the page keeps loading and loading and loading….
• I fix a bug in some code, compile, and run. The bug is not fixed. I go back to the code and the fix I made has disappeared. I fix it again, compile, and run. The bug is not fixed… [repeat ad infinitum]
• I keep breaking and buying an infinite number of ethernet/modem dongles on the laptop.