Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

81 x 9 = 801. What must you do to make the this equation true?

What has 88 keys?

How many times do a clock's hands overlap in a day ?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?