I once shared an office with a French girl who was very highly strung. She was obsessed with people touching stuff on her desk. So, naturally, every day I (and the other couple of people in the office) would come in in the morning and move the keyboard, mouse, monitor and so on. Just a little, but she always knew her stuff had been messed with.
She complained to our boss. He frankly was the worst one for winding her up. At home he had a kids desk, like the old primary school ones with the lid that lifts up. He had planned one day to swap her desk for this one but couldn't think where to put her normal one, so settled for the chair.
She came in and her office chair had been replaced by a little wooden one that was made for 5 year old kids. Meltdown. Utter meltdown, far beyond what was called for. The boss brought her chair through (claiming to have found it in a cupboard) and she settled down.