Way back when, in the time of yesteryear, we would use anything we could find to be our makeshift furniture. We would even pull a table out of a dumpster if it looked sturdy enough. Now though, we’re respectable adults who have worked hard for our fine furniture and wooden coffee tables. While the word coasters may have been annoying in the past, they are now a necessity if you want to prevent any lasting damage to your hard-earned house decorations.

No one really ever remembers to use a coaster, but if we had ever learned anything from Portal, it’s that warning signs will help anyone remember what to do. These Portal 2 Warning Sign Coasters come in a set of 8, and will let all of your friends know what may befall them if an appropriate seat for your drink is not obtained. They are extremely cheap at only $19.99, and will be a fun way to remind guests not to put a watery ring of death on your table top.