Here are some randomly selected joke topics beginning with the letter 'R'
Rage
Why are you so angry?
Because it's all the rage.
Race
Did you hear about the man who lost the race
because of his socks? They were guaranteed not to run?
Railway
Please don't cross the railway lines, they take hours to unravel
Rabbits
What do you get if you pour warm water down a rabbit hole?
Hot cross bunnies.
Rabbits
Did you hear about the rich rabbit?
He was a millionhare.
Rabbits
Why do rabbits have shiny noses?
Because their powder puffs are at the wrong end!
Rabbits
How do rabbits go on vacation?
In a hareplane.
Radio
Knock, knock.
Who's there?
Alison.
Alison who?
Alison to the radio every morning.
Race
How do you start an insect race?
One, two, flea, go.