Unnecessary lurches

For a couple of years I was given the same classroom at the place I work today, and the teacher's podium had a wonky leg. It lurched when I leaned on it.

This year I was assigned a room with a stable podium. The room is identical in every other way, but the podium does not lurch. However, I am so used to a lurching podium that I EXPECT it to lurch, and when it doesn't, I do.

You can't imagine how irritating this is.