with pascal's law, all you do is fill up the small chamber with ALL your spew, then (because of lag) go to the button and hit it. Voila! you just beat the level.
the only problem i have is that if you get hit with a rocket, and hit a wall, you get killer or nearly killed. that was a problem i had till i just said "screw it" and superspammed the rifle.
i got the barcodes on the cereal box, the cans, the guy's neck, the zebra, the white house, the circus, the hallway, and the other obvious spots and the end. where's the last one?