What always comes into a house through the keyhole?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Can you find the missing piece of the Porsche?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

By using 'because' continuously three times, can you make an English statement ?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?