Chairs. Chairs are a thing made for humans. Chairs reduce the complex strains your body can come under into an easily managed, easily digested form. Chairs can be arranged and multiplied into hundreds or thousands, effectively destroying your individuality. Chairs are be used to quietly persuade and control you, by influencing and demanding where you go and the rules under which you go there. You can sit beside someone on a chair, and talk to them, and neither of you will ever understand the other.
Farts. Farts are an expulsion through the rectum of a mixture of gases that are byproducts of the digestion process of mammals and other animals. Farts are things that most people would rather you keep to yourself. In that way, farts are like Facebook.