Not strictly humor, but truly amazing....
Dormitory = Dirty Room
The Morse Code = Here Come Dots
Slot Machines = Cash Lost in 'em
Animosity = Is No Amity
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
The Earthquakes = That Queer Shake
Eleven plus two = Twelve plus one
Contradiction = Accord not in it
THEN ONE A LITTLE LONGER:
Original: "That's one small step for a man, one giant leap for mankind."
Anagram: "A thin man ran; makes a large stride, left planet, pins flag on moon! On to Mars!"
AND THIS ONE'S TRULY AMAZING:
Original: "To be or not to be: that is the question, whether tis nobler in the mind to suffer the slings and arrows of outrageous fortune."
Anagram: "In one of the Bard's best-thought-of tragedies, our insistent hero, Hamlet, queries on two fronts about how life turns rotten."