Im sorry but Gintama is definetely the best when it comes to its chapters titles.
- Stress Makes You Bald, But It's Stressful to Avoid Stress, so You End Up Stressed Out Anyway, so In the End There's Nothing You Can Do.
- Marriage is Prolonging an Illusion for Your Whole Life
- You Only Gotta Wash Under the Armpits---Just the Armpits
- You Always Remember the Things that Matter the Least
- Men Have a Weakness for Girls Who Sell Flowers and Work in Pastry Shops
- When Someone Who Wears Glasses Takes Them Off, It Looks Like Something's Missing
- You Can't Trust the Previews for Jump's Next Volume
- German Suplex Any Woman Who Asks, 'Which Is More Important, Me or Your Work?'
There are so many to even choose but almost each one is great.
Why's the Sea so Salty? Because You City Folk Pee Whenever You Go Swimming!
Marriage is Prolonging an Illusion for Your Whole Life
The Best Makeup for Women Is Their Smiles
When your half eaten popsicle starts sliding down the stick, that's when jerks come around hoping for a share
Beautiful people get boring after 3 minutes, ugly people you can live with forever
New Sentai Sentais Seem to Start Out as Things You Could Never Approve of, but by the Last Episode, You Don't Want Them to go Away
Making Light of Early Plot Elements is Fatal
I think a big part of Gintama's appeal is the insanely honest and relatable chapter titles. It and Bleach are the only ones with really memorable chapter titles, although Bleach's tends to fall on the meme-ish side for us English speakers. Like a previous poster said, the poems for each character are really neat.