"Anagrams" joke

An anagram, as you all know, is a word or phrase made by rearranging the letters of another word or phrase. The following are exceptionally clever.

Note the word and then the re-arranged letters:

Dormitory... Dirty Room
Desperation... A Rope Ends It
The Morse Code... Here come Dots
Slot Machines... Cash Lost in' em
Animosity... Is No Amity
Mother-in-law... Woman Hitler
Snooze Alarms... Alas! No More Z's
Alec Guinness... Genuine Class
Semolina... Is No Meal
The Public Art Galleries... Large Picture Halls, I Bet
A Decimal Point... I'm a Dot in Place
Eleven plus two... Twelve plus one
Contradiction... Accord not in it
Astronomer... Moon Starer
Princess Diana... End Is A Car Spin
Year Two Thousand... A Year To Shut Down