Here are some randomly selected joke topics beginning with the letter 'I'
Idiot
I'm not a complete idiot, some parts are missing!
Idiot
Did you hear about the idiot who thought the Cote d'Azur was a blue jacket?
Idiot
Did you hear about the florist who had two children?
One is a budding genius and the other one is a blooming idiot.
Idiot
Did you hear about the idiot who buried his car battery when the auto mechanic told him that it was dead?
Idiot
Did you hear about the idiot who planted pennies in his garden?
He wanted to raise some hard cash.
Idiots
Why did the idiot put on wet trousers?
Because the label said 'wash and wear.'
Iceberg
Never mind the Titanic - is there any news of the iceberg?
Idiots
Did you hear about the idiot who put his radio into a refrigerator?
He wanted to hear some cool music.
Idiot
Did you hear about the idiot who called both his sons, Ed?
He thought two eds were better than one.