Working at a help desk gives you plenty of time to dream up answers that you wish you could give to customers who really deserve it. This was one of mine. It’s funnier if you are as much a fan of British programs as I am, or if you’re wealthy enough to know about dormer windows (they seem to have gone out of fashion with contemporary home-builders). Another reason to support Linux: It’s a greater challenge to work up a good pun for them. Volunteer your best tries in the comments!
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