Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What has lots of eyes, but can’t see?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What's the only room from which no one can enter or leave

What does this rebus mean?

O
N
C
E
TIME

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

What does this say?

XLR8

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

What number divided by 4 is the same as that number minus 4?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?