SCP-055 is an information autosuppressor known as an "antimeme" that causes anyone who examines it to forget its characteristics, thus making it indescribable except in terms of what it is not.
SCP-087 is a staircase that appears to descend infinitely and inhibits any light within its space. The staircase is inhabited by SCP-087-1 and SCP-087-2, described as a face without a mouth, pupils or nostrils.
SCP-108 is a Nazi bunker system that is accessible only through a portal found in a woman's nose (0_0).
SCP-173 is a humanoid statue composed of rebar, concrete and Krylon spray paint.[6] It is immobile when directly observed, but it attacks people and breaks their neck when line of sight with it is broken. It is extremely fast, to the point where it can move multiple meters while the observer is blinking.
SCP-294 is a coffee vending machine that can dispense anything that does or can exist in liquid form—including, on occasion, abstract concepts. Regardless of the properties of the substance chosen, the machine's polystyrene cups appear to suffer no damage from the substances dispensed into them.
SCP-426 is a toaster that can only be referred to in the first person
SCP-999 is a gelatinous slime mold-like creature that smells similar to whatever is most comforting to the person it makes contact with. It has a friendly personality and is known to induce positive emotions on contact with humans and other organisms. Therefore, it is sometimes used as a tool by the SCP Foundation.
SCP-1171 is a home whose windows are covered in condensation; by writing in the condensation on the glass, it is possible to communicate with an extra-dimensional entity whose windows are likewise covered in condensation. This entity bears significant enmity towards humans but does not know that the Foundation members are humans.
SCP-1609 is a wood chip mulch that teleports into the lungs of individuals displaying aggressive behavior towards it. Previously a benevolent chair that teleported to nearby individuals who needed to sit down, it became aggressive after being destroyed in a woodchipper by the Global Occult Coalition
https://en.wikipedia.org/wiki/SCP_Foundation.