Tables are turned

WE all know what the expression "the tables are turned" means. It  says roles are  reversed. But why isn't it "the table is turned".
       I can think about stuff like this intermittently over a week or a month. I usually give up after a year if I have not figured it out.
       Anyway the table is turned here because I an giving an interview rather than taking one.

7 Reasons to read 7 Shouts

WE are all sick of reading the same old stuff, week in week out.

I probably only have to give you one good reason to read a good Bent Banana Book, a book which is different. But I am a generous sorta bloke and I will give you 7.

7 reasons you must buy Iraqi Icicle

7 reasons you must buy Iraqi Icicle

You must buy this now or live with regret and no-one wants that.

I presume I have your attention with that recommended bait headline.