Scrabble It

DORMITORY:
When you rearrange the letters:
DIRTY ROOM

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

SLOT MACHINES:
When you rearrange the letters:
CASH LOST IN ME

ANIMOSITY:
When you rearrange the letters:
IS NO AMITY

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

SNOOZE ALARMS:
When you rearrange the letters:
ALAS! NO MORE ZS

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

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

Riddle me this:
What occurs once in a minute, twice in a moment, but never in a
thousand years?

ANSWER: The letter M