Here are some randomly selected joke topics beginning with the letter 'O'
Obedient
My new dog is very obedient. When I say 'heel' he always bites me on the heel.
Office
In any office you can always tell who the boss is. He's the
one who watches the clock during your coffee break.
Office
"Duties will vary."
Anyone in the office can boss you around and tell you what to do.
Offers
What should you do if someone offers you a rock cake?
Take your pick.
Octopus
What do you get if you cross an octopus with a cow?
An animal that can milk itself.
Octopus
Did you hear about the neurotic octopus?
He was a crazy mixed-up squid.
Obesity
New study of obesity looks for larger test group
Octopus
Q: How does a male octopus ask a female octopus to marry him?
A: Can I have your hand, your hand, your hand, your hand ...
Octal
Counting in octal is just like counting in decimal, if you don't use your thumbs.