Just as an aside, a few years back, SWMBO and I called in at a cafe and by chance we met up with a lady friend and her mother. Subject matter got around to our carpet. SWMBO commented that the carpet was not to her liking at all. I impressed on her that it wasn't going to be changed until it was worn out.
The lady friend with a straight face, but a distinct twinkle in the eyes said, "Ooh, won't that make your knees rather sore?"
I did my impression of a beetroot as I nearly fell off the chair laughing. As I was saying it I realised the opening I had given her :- .
Regards
Paul