What is both possible and impossible at the same time?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Which wheel of car does not rotate when you turn your car right?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain