I read an article a while ago about some scientist who decided that he wanted to go around investigating a certain species of leech that lives inside a hippo's butt, like attached directly to the colon. He suggested that, as big as the hippo is, it probably wasn't really all that aware that the leeches are even in its butt, but that's where the leech likes to be because there's a good source of blood there for the leech to feed on.<p>Now, the scientist is probably right, the hippo probably goes its whole life not really knowing that it has all these leeches in its butt. It might feel a little pain in the butt, but the hippo probably isn't concerned with why that pain is there, much less how or even if it can get rid of it, it's just something that the hippo has always lived with. The hippo accepts that one of the facts of daily life is that you just need to live with some pain in your butt.<p>Now, imagine (and believe me, this is a hypothetical), if the hippo let someone root around inside its butt and remove every one of the leeches, and even stop any others from attaching. It might take a day or two to get used to and get back to normal, but the hippo would wake up one day and realize that it no longer has a pain in its butt. It can still do everything it used to do, it can frolic in the water, it can roam around and find the tender little pieces of grass, it can do that thing where it poops and swishes its tail around to spread it all over its neighbors, and it realizes that it can do all of those things it likes without having that pain in its butt.<p>Now, maybe the leeches could talk. Maybe the leeches talk to the hippos and they say things like, listen, hippo, my life cycle depends on you letting me get into your butt when you're in the water. I need to drink your blood and drop out some eggs, so that other leeches can be born and start the cycle all over again. It's not really a big price you pay, I mean sure, there's a little pain in your butt, but I need you to do this. If you want to get in the water, it's just something you have to deal with. It's the price of admission. If you get in the water without letting me in your butt, it's like you're stealing the water.<p>I bet that the hippo would hear that, and would still want to continue going about its day without any pain in its butt. I don't think the hippo would feel very sorry for the butt leech. Sure, maybe the butt leech contributes to the aquatic ecosystem, maybe its eggs or the dead leeches get eaten by other things and fertilize the grass that the hippo likes to eat. But, if the leeches weren't there, the grass would just find other nutrients. Even though the leech is trying to argue that it's a necessary part of this ecosystem, it's actually just a pain in the butt. In reality, despite what it tells everyone else, the major beneficiary of anything that the butt leech does is the actual butt leech.<p>Anyway, I just had a thought that advertisers kind of sound like hippo butt leeches.