To pun is human...

A bicycle can't stand on its own because it is two-tired.
What's the definition of a will? (It's a dead giveaway).
Time flies like an arrow. Fruit flies like a banana.
A backwards poet writes inverse.
In democracy it's your vote that counts. In feudalism it's your count that votes.
She had a boyfriend with a wooden leg, but broke it off.
A chicken crossing the road is poultry in motion.
If you don't pay your exorcist you get repossessed.
With her marriage she got a new name and a dress.
Show me a piano falling down a mine shaft and I'll show you A-flat minor.
When a clock is hungry it goes back four seconds.
The man who fell into an upholstery machine is fully recovered.
A grenade thrown into a kitchen in France would result in Linoleum Blownapart.
You feel stuck with your debt if you can't budge it.
Local Area Network in Australia: the LAN down under.
He often broke into song because he couldn't find the key.
Every calendar's days are numbered.
A lot of money is tainted. It taint yours and it taint mine.
A boiled egg in the morning is hard to beat.
He had a photographic memory that was never developed.
A plateau is a high form of flattery.
The short fortuneteller who escaped from prison was a small medium at large.
Those who get too big for their britches will be exposed in the end.
Once you've seen one shopping center you've seen a mall.
Those who jump off a Paris bridge are in Seine.
When an actress saw her first strands of gray hair she thought she'd dye.
Bakers trade bread recipes on a knead to know basis.
Santa's helpers are subordinate clauses.
Acupuncture is a jab well done.
Marathon runners with bad footwear suffer the agony of defeat.