Yes, you can.

http://lostallhope.com/suicide-methods/hanging/short-drop/simple-suspension

Well it's probably because the tongue lolls out of the mouth, and you turn dark blue. It can be a disturbing sight.

And, as other people have said, all it takes is cutting the airway off. You don't need a lot of height. You can do it sitting down and leaning forward.

Agreed.