State Of War Puns

The were The Ruff Riders.

In a perpetual state of war.

Days That Are Puns

1/23 - January 23rd reads like 123
3/10 - Mar10 Day - Nintendo's Mario Day
3/11 - There's an awesome band called 311
3/14 - 3.14 is the first few digits of Pi AKA Pi Day
5/4 - May the 4th be with you - A pun on "May the force be with you." AKA Star Wars Day
7/11 - Free Slurpee Day at 7 Eleven stores
9/11 - No intention of being offensive with this one. 9/11 reads like the emergency phone number used in the United States
10/4 - Pun for 10-4, which is similar to saying "roger that"
10/23 - National Mole Day (Avogrado's number) 6.02 x 10^23

Please mention any I missed!

This was from high school before I became a dad, but I think it still qualifies.

My history teacher was lecturing on the Paris Conference following World War I. Specifically, he was discussing each of the world leaders in attendance and each of their aims for the treaty that would result from the conference.

He was going down the line of leaders and asking the class what each leader wanted in the treaty. For example, "Britain was represented by Prime Minister David Lloyd George. What did Mr. George want in the treaty?"

He got through Britain, France, and Italy, then he came to the United States, represented by President Woodrow Wilson.

He asked, "What did Mr. Wilson want?" I responded, "Dennis out of his life once and for all?"

He and I were the only people who laughed.