Here are some randomly selected joke topics beginning with the letter 'Z'
Zebra
What do you get if you cross a zebra with an ape man?
Tarzan stripes forever.
Zebras
What is red and black, red and black, red and black?
A zebra with sunburn.
Zebras
Why was the zebra made leader of the animal army?
Because he was the one with the most stripes.
Zoo
What is a zookie?
A key to the zoo.
Zebras
What do you call a horse wearing Venetian blinds?
A zebra.
Zoom
Knock, knock.
Who's them?
Zoom.
Zoom who?
Zoom did you expect?
Zap
When you send a lazergram don't forget the Zap code.
Zombies
What do you call a zombie who has a bell?
A dead ringer.
Zombies
Why was the zombie awarded a medal?
Because he was dead-icated!