What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

The more of this there is, the less you see. What is it?

What is the largest number you can write with just 3 digits?

Which is faster, Heat or Cold ? Explain.

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

No matter how little or how much you use me, you change me every month. What am I?

Replace the question mark with the correct number below.

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

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?