I was highly annoyed. I was looking after the children, but had a hair appointment at 10 o'clock so was going to drop them off with Al in the shop for a while. One car seat is usually kept fixed in the car, but the other only goes in when it's needed. It's a bit awkward to fix in place, but not that much trouble. The Sage said he'd take it to the car for me and put it in if he could. We all went out and I stared in dismay. Somehow, he'd put it in upside-down. That is, the seat back was horizontal and the seat cushion was vertical. He'd threaded the seatbelt through where it was supposed to go, I've no idea how as it should be tilted up to give room, and fixed it firmly with the clips, which were well stuck down as it was all done at the wrong angle. I can't imagine how he didn't see that the fixing for the belt was, in the place he'd put it, right in the middle of the child's back.
It took me ten minutes to get it out and put it in again and I hadn't allowed that much time. I had to carry Pugsley, who is a sturdy toddler, as there wasn't time to let him walk and I was limping heavily in no time.
The Sage was abashed when I told him. Fortunately, I didn't see him for an hour or so, so at least I didn't shout. I did describe him to his grandchildren as an 'idiot' however.