A man dies of old age on his 25 birthday. How is this possible?

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.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

When it's bad luck to meet a black cat?

If an electric train is travelling south, then which way is the smoke going?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What shoe company does this rebus represent?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?