Popular Short Funny Riddles

A skin have I, more eyes than one. I can be very nice when I am done. What am I?
How many times can you subtract the number 5 from 25?
What is significant about the order of these numbers : 2 3 6 7 1 9 4 5 8?
You write on me and secrets I can keep; In places never seen, I spin like a top; Though stiff as a board, I'm often described like a mop. What am I?
Take away my first letter and I am unchanged; Take away my second letter and I am unchanged; Take away all my remaining letters and I am still unchanged! What am I?