Riddles
Riddles!
This topic is about short riddles, because not everyone likes to do the larger logical puzzles. If you do like those, then click here.
If you've guessed the riddle, you can immediately post another one yourself. Let's keep it going. 
I will start with this riddle:
What is easy to get into, but hard to get out of?
My name's comprised of only six, Unique, though? Only three
At the end you'll find mother's mom Just take a look and see.
An official prohibition is up at the front, a clue for your avail
All together, I can be used To give an ad hoc sense of scale.
Who or what am I?
Tread on the living, they make not a mumble. Tread on the dead, they mutter and grumble.
What are they?
Mistake me for half of a pair
You might, with a just a glance
Yet see my faces, nothing there
I'm no device of games of chance
But when my hour has finally come
A warm bath for my ablution
I disappear to become
A part of the solution
Who or what am I?
Four letters stand to make my name. Should 2 be taken, 4 remains. And should they take away 1 more, my meaning will be as before.
Who or what am I?
@DarkWolf
Husband thinks it is the Roman numerals CXIV or 64.
Take two away and you get IV or four. Take another one away say the V and you are left with one which is still as before a Roman numeral.