I just read a really excellent short story by David Foster Wallace called "Mr Squishy". It's about a corporate focus group for a giant company called Mr Squishy that sells a Twinkie type foodproduct whose mascot is a blandly iconic smiling cartoon character, a generically likable cartoon that's meant to be familiar, easily categorizable and unthreateningly pleasant to everyone around. The focus group is for a new product by the same company called Felonies!, which is trying to capitalize on resentment of healthfood, that's trying to sell an idea of being a renegade, going against trends, being unrepentantly into immediate personal satisfaction.
At first it's told from what seems to be an omnisceint narrator, and only gradually does a protagonist emerg, in the person of the focus group facillitator, a sort of lonely loser type, plugging away at his pointless job, feeling worthless because he sees through all the bullshit he has to peddle to people, and sees through the way the company manipulates statistics so that they appear to say what they wanted them ahead of time to say, and is trying to tell himself that his job has meaning.
Meanwhile, the narrator, presumably speaking in the suposed-protag's voice, talks about how easy it would be to poison some of the cakes undetectably, and thereby destroy the company and perhaps the whole snackfood industry.
Meanwhile, emanwhile, some sort of human fly begins to crawl up the otuside of the building (Are we even certain it's the same building where the focus group takes place). A group of people outside begin to wonder if he is some kind fo psychopath about to open fire, or fi it's some kind of publicity stunt. At the same time, the narrator suddenly speaks in the first eprson and it very slowly becomes clear that the narrator is one of the focus group subjects, and he has some kind of contraption in his person to make it look like he is vomiting after having eaten the test product.
As the story nears its close, it turns out that the company knows exactly how bullshit the focus group is, and how they cook the stats, and really the test administrator (the former protag) is being tested, to see if how much he influences the meaningless tests he gives. If he makes too much of a difference, he will be fired, and if he truly does have no impression on the people he tests, then he will be allowed to continue in his meaningless job that he knows is meaningless, but that he doesn't know all his superiors also know it is.
It's all about advertising, and counter-advertising to the idea that everyone thinks they're beyond advertising, somehow special and unique.
The human fly climbs up to the top of the building, being watched by what seems like a test group, people who don't know if they are being tested. He has some sort of device attached ot his body, and an inflatable suit that blows up. We as readers don't know if his suit blows up and he's just a guy dressed up as Mr Squishy, and/or if he's going to open fire or spray poison, or if he's just a harmless ad stunt.
We also don't know if the former protag was going to poison those people, or if he's being set up, or if the company itself is going to poison people, so that they, like Tylenol, can make a big show of making ammends for their negligence (which in this case may be full-scale malevolence) and wind up actually having a better reputation after having killed people.