I have currently purchased the following t-shirts....

mmmh.. Delicious
Ninteen Seventy Five
FIll Me Up
Octopus
Zen Gardens Make Me Angry
Insomnia
H20's Sacrifice
The Accident
Pretty World Inferno
Rollin' Hatin'
Water, Just Water
Poker Hand Values
Play
Quack Attack
The Communist Party
King Me Mask
You've Got Some 'Splaining To Do!
X-Ray Goggles Work
Musical Meditation
What Makes It Go?
Lions Are Smarter Than I Am
Haikus are easy but...

And my current favourite is... "The Communist Party!"