Here are some randomly selected joke topics beginning with the letter 'N'
Nag
How many men does it take to screw in a light bulb?
Only one, but you have to nag him for a fortnight first.
Nail polish
How many supermodels does it take to change a light bulb?
None - "Do you want me to ruin my nail polish?"
Name
What is another name for a store detective?
A counter spy.
Nametags
Why do witches wear nametags?
So you can tell which witch is which.