I tend to be quiet while tripping, but when I say something it's been worked on and stored up all night and it's usually a doozy. Here are two of my best (that, I'm proud to say, each had around a half-dozen people tripping on acid/E/K/weed at a rave go silent in contemplation... or, at least, thoughts of 'holy shit this guy is tripping HARD'). They're obviously paraphrased, cuz I can't remember all the tangents I went on to get them out:
"What if we ARE in the Matrix? No, really. Seriously consider it. People are getting a little to savvy about computers, so it'd be bound to come out, and soon. So they make a movie about it, making it fiction, so people will laugh when others consider it. Didn't you laugh? That's, like, proof. Oh. And drugs are like the rebels ways of communicating with us, and it's how we see things PERFECTLY. But the system doesn't want us to see things PERFECTLY. That's why they invent long, scary names like 'methyldioxymethamphetamine' and spread lies about how dangerous they all are. IT'S SO WE CAN'T BE RESCUED FROM THE MATRIX BY THE REBELS WHO ARE FEEDING US ACID!"
Another one:
"Science fiction is all wrong. Cuz, like, in the 24th century, humans aren't going to be unchanged. Unless we create a totalitarian world state that forbids all kinds of genetic engineering, we're going to eventually get scientists that make smarter scientists. And they'll make even SMARTER scientists. And soon, VERY soon, we'll have SUPER BRILLIANT scientists. Our brain capacities will outgrow biology. We'll be infinitely complex sentiences (is that even a word?) inside supercomputers. Or huge brains in vats like the guy in Ninja Turtles. Except we'll be controlling armies of robots because we can. And it'd be awesome to have, like, a dozen bodies to do stuff with."
If I save it up and work it over, I can spit it out pretty good. But if someone catches me by surprise, I'm like "hi... you said words and..." *baby whimper* "don't, please..."