If you're old enough to remember the joyus days of 'All Your Base', then you will simultaneously smile and cringe when you see this. Speaking of irony, let's be clear that 'Snakes on a Plane' is likely to be a milestone in the sense that we're now making ironic movies- with real Hollywood stars!
The bit about ironic t-shirts is fairly spot on, though I secretly actually sort of like ironic t-shirts. At what point does being ironic about irony become a double negative and wrap around?