Til the end

I was in Marks and Spencers earlier today, picking up a salad for my lunch. I went to the quick "5 items or less" tills (now relocated to by the front door), which are numbered from left to right 17, 18, 19, 20, 21, 22. But no. 22 had a sign on it saying "This till is out of order". But it wasn't! It was in exactly the right place. This is actually true, not just a crappy joke.