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.
Broken leg
Doctor, Doctor, what can I do about my broken leg?
Limp.
Britain
In Britain, what do they call Christmas?
Yule Britannia.
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.
Britannia
In Britain, what do they call Christmas?
Yule Britannia.