Here are some randomly selected joke topics beginning with the letter 'B'
Bulls
What do you call a bull when it is sleeping?
A bulldozer.
Bunnies
What do you get if you pour warm water down a rabbit hole?
Hot cross bunnies.
Bulb
He's not the brightest bulb on the Christmas tree.
Bun
Did you hear about the baker who got an electric shock?
He stood on a bun and a current ran up his leg.
Bulldozer
What do you call a bull when it is sleeping?
A bulldozer.
Bull
Enraged Bull Injures Farmer With Axe