Answer:
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
What can you catch but not throw?
A necessity to some, a treasure to many, I'm best enjoyed among pleasant company. Some like me hot, some like me cold. Some prefer mild, some like me bold. What am I?
I come in variety of colors and am found almost year round. My house is tall and my only fear is the cold. What am I?
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
I flow from the Homerβs mouth when he sees doughnuts.