There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

How many sides does a circle have?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?