The robot, labeled R-S-H, is having an existential crisis about its purpose, only to be told it "smells bad" - which is chemically accurate. In organic chemistry, while alcohols (R-OH) are often pleasant-smelling compounds, thiols (R-SH) are notorious for their putrid odor. Even in trace amounts, thiols make rotten eggs and skunk spray unbearable. The robot's devastated "Oh my God" reaction is every undergrad who accidentally made thiols in the lab and cleared out the entire building. Chemistry's version of being told your life purpose is to repel everyone around you.