Here are some randomly selected joke topics beginning with the letter 'B'
Boot
Why can't a car play football?
Because it only has one boot.
Born on a farm
I hear you were born on a farm. Any more in the litter?
Boring
Patient: Doctor, I keep thinking that I'm a woodworm.
Doctor: How boring.
Boots
What do you get if you cross a cat and a pair of wellingtons?
Puss 'n' boots!
Boring
I was going to tell you a joke about an electric drill, but it's too boring.
Boring
Termites are boring
Born free
Knock, knock.
Who's there?
Bjorn.
Bjorn who?
Bjorn free.
Boring
What do you call a large pack of black and white spotted dogs that are boring?
101 Dull-matians.
Boring
How many boring people does it take to change a light bulb?
One.