Here are some randomly selected joke topics beginning with the letter 'B'
Broke
I'm so broke, I can't even afford to pay attention.
Broomsticks
How do witches keep their hair in place while flying on their broomsticks?
They use scare spray.
Broomstick
My wife's other car is a broomstick
Broken leg
Doctor, Doctor, what can I do about my broken leg?
Limp.
Broomstick
My brother saw a witch riding on a broomstick. He said, 'What are you doing on that?'
The witch said, 'My best friend's got the vacuum cleaner.'
British Rail
How many British Rail staff does it take to change a light-bulb?
Two. One to change the bulb and one to apologize for the delay.