What does this rebus mean?

O
N
C
E
TIME

Guess the hidden movie name?

What does below rebus means ?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What is next number in the pattern below:

131 517 192 123 ?

How can you tell a raw egg from a hard-boiled egg?

When we see 2 but call 10?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?