How can you leave a room with two legs and return with six legs?

Can you make a six-letter word using the letters N, A and B ?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What is the word or phrase below?
R | E | A | D

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

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