Forget-Me-Nows are a pill G.O.B. makes use of when he needs people to forget an event. G.O.B. gets caught in a roofie circle for several years due to his taking the pill, which led to him being hospitalized for stage four syphilis.
Tobias identified them as Flunitrazepam, or Rohypnol, tablets (also known as roofies), which cause temporary amnesia. Such tablets have been known to be used for a number of illegal and morally reprehensible actions such as date rape and robbery. Maeby referenced the pill in her fourth senior Yearbook quote, "Life is a roofie circle" ("Señoritis")
- Flunitrazepam on Wikipedia