Only for the smart.

[Omnis]

[1] There is a dead man in the center of an empty intersection. He had with him an unopened parcel. As he neared the center of the road, he knew he was going to die. How did he know he was going to die?

There are two possible answers:

The Parachute didn't open.
He was a terrorist but was shot by our Rangers before he could detonate.

[2] A woman shoot a man.
Then she held him under water for over 5 minutes.
Finally, she hung him.
But 5 minutes later the man was still alive.
How can this be?

She is a photographer.

[3] How can you figure out a building's height with a single barometer?

This was given to me on a Physics test back when I was in High school. Pretty simple.

Give it to the custodian in exchange for the building's height :P

The other answer is long and complicated. Mostly having to do with the temperature and gravity.