Answer:
An appropriately loud response to fear, excitement, or your team scoring.
I have one eye, See near and far, I hold the moments you treasure, And the things that make you weep.
What ship has no captain but two mates?
I travel the world and I am drunk constantly. Who am I?
These are believed to be found at the end of rainbows
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.