Where do you go to learn how to make ice cream?

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.

What does below rebus means ?

Who always enjoys poor health?

Buy me, smell me or deliver me, I do not change.

Who am I?

I can write cow in 13 letters.

Can You?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

If two's company, and three's a crowd, then whats four and five ?

What does a man do only once in his lifetime, but women do once a year after they are 29?