Why is it very easy to weigh a fish?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

10+10 and 11+11 can give you the same answer.

Explain how?

Who is that with a neck and no head, two arms and no hands? What is it?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

How can a man go eight days without sleep?

When we see 2 but call 10?

What part of the chicken has the most feathers?

What begins with T, ends with T, and has T in it?