What is full of holes but still holds water?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What does below Rebus say?

XLR8

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

When is the top of a mountain similar to a savings account?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

How can you drop a raw egg from a height onto a concrete floor without cracking it?