Here are some puns for your enjoyment

The fattest knight at King Arthur’s round table was Sir Cumference.  He acquired his size from too much pi.

No matter how much you push the envelope, it’ll still be stationery.

Two silk worms had a race. They ended up in a tie.

Two hats were hanging on a hat rack in the hallway. One hat said to the other: ‘You stay here; I’ll go on a head.’

I wondered why the baseball kept getting bigger. Then it hit me.

The soldier who survived mustard gas and pepper spray is now a seasoned veteran.

A backward poet writes inverse.

When cannibals ate a missionary, they got a taste of religion.

If you jumped off the bridge in Paris, you’d be in Seine.

Two fish swim into a concrete wall.  One turns to the other and says ‘Dam!’

Two hydrogen atoms meet.  One says, ‘I’ve lost my electron.’ The other says ‘Are you sure?’ The first replies, ‘Yes, I’m positive.’