A pun is a funny game of words; however these sentences can have two or more means.
For Example:
Question: Why do we still have troops in Germany? Answer: To keep the Slovaks in Czech.
A man bought a cattle ranch for his sons and named it the 'Focus Ranch' because it was where the sons raise meat.
When drinking, don't drive. Don't even putt.
A joke is a funny story that one person tell to make other people laugh.
For Example:
What's the difference between a new husband and a new dog?
1) After a year, the dog is still excited to see you.
Money can't buy happiness; it can, however, rent it.
Money can't buy you happiness but it does bring you a more pleasant form of misery.
Men who are unhappy, like men who sleep badly, are always proud of the fact.
A man doesn't know what hapiness is until he's married. By then it's too late.
Happiness is good health and a bad memory.