Here are some randomly selected joke topics beginning with the letter 'F'
Failure
Predestination was doomed to failure from the start
Fail
If you try to fail, and succeed, which have you done?
Fairies
What do you call a fairy that never takes a bath?
Stinkerbell.
Factory
Billy: Why did you quit your job at the toffee
factory?
Joe: I bit off more than I could chew.
Fading
Knock, knock.
Who's there?
Faye.
Faye who?
Fayeding away.
Factory
What do you call a man who breaks into a meat factory?
A hamburglar.