I've always wanted to snag this off the bulletin board at work. Here is a VERY CLEVER play on letters!

DORMITORY When you rearrange the letters: DIRTY ROOM

DESPERATION When you rearrange the letters: A ROPE ENDS IT

THE MORSE CODE When you rearrange the letters: HERE COME DOTS

SLOT MACHINES When you rearrange the letters: CASH LOST IN 'EM

ANIMOSITY When you rearrange the letters: IS NO AMITY

A DECIMAL POINT When you rearrange the letters: I'M A DOT IN PLACE

THE EARTHQUAKES When you rearrange the letters: THAT QUEER SHAKE

ELEVEN PLUS TWO When you rearrange the letters: TWELVE PLUS ONE

ASTRONOMER When you rearrange the letters: MOON STARER

PRINCESS DIANA When you rearrange the letters: END IS A CAR SPIN

And the grand finale...

MOTHER-IN-LAW When you rearrange the letters: WOMAN HITLER

Now that's soom good "spam".