My colleague is getting a new extension cord which will run along the full length window. He opened the blinds yesterday in advance of getting the cable today. It only takes a second to open the blinds yet we have to sit here blinded by the brightest light. I have mentioned it but he said he will be going to get one at lunchtime. I have put sun blockers in the way and am crouching behind them. I am only answering him monosyllabically. What passive aggressive/petty means can I wheel out to make him realise that this is THE MOST STUPID THING A HUMAN HAS DONE.