Good Riddles

Question: Why is the man standing in the sink?

Question: What has no friends, crippling depression, and serious trust issues?

Question: What can you smell but not see. And can be deadly, too.

Question: Twelve pears hanging high, twelve men passing by. Each took a pear and left eleven hanging there. How can this be?

Question: Looking at my face, I'm no more than six.
Look at the rest of me and I'm 21.
You'll see my twin and me in Las Vegas.
Say my name and you'd be uttering a threat.

What am I?