Propofol, which nickname is "Milk of Amnesia." Michael Jackson was taking Propofol to sleep, which is like doing chemotherapy because you're tired of shaving your head.Seen here.
I woke up from my heart surgery after propofol - I had the surgery in Cleveland - after propofol I woke up from the surgery and said "Where am I?" and they went "Cleveland!" and I went, WHY?
UPDATE: 8/11/14 - And Robin Williams has left us. Dammit.