If you really wanna see the craziest shit the place has to offer, check out /r9k/ and /pol/. They never fail to entertain me when I'm bored.
I only trolled the fetid waters of /b/ during the Trials of Teague, just helping keep watch for any new attacks they might have come up with.
It was quite something - it was pure, uncut Internet. It was the internet politicians think is everywhere but is actually pretty rare unless you really really look for it. Or trip and fall into it, like I did. It was an internet I'd never seen before, in thirty-some years of using the internet. It was like Hannibal Lecter's Tumblr. It was John Doe's TED talk. It was a wormhole journey to Vega and I was a tiny Jodie Foster, trembling at its enormity.
In the space of one evening trolling /b/ I saw maybe a dozen of the most horrifying images I've EVER seen (and I've been to Hong Kong). One of them was also THE FUNNIEST lolcat-style meme I have ever seen - because the image was so horrific. I would never ever post that image anywhere - I might try describing it to somebody, maybe - and yet it was for me, the ultimate use of the lolcat meme format, so breathtakingly awful and thus hideously funny, that the entire lolcat thing should probably just be retired entirely. It has been won.
I don't know if I will ever look at 4chan again. But I have seen it. And for me, the world is forever changed.
Reddit meanwhile was a lot of tiny text. I didn't stick around.