Batman Vol.1 #286 (Newsstand)
The Joker breaks out of Arkham Asylum and shrinks and kills his psychiatrist with a strange liquid; Robin convenes with Batman and Commissioner Gordon beside the doll-sized corpse of Dr. Tugwell, who has written "RIP" in the sand beside him; Batman deduces the letters stand for Revelry In the Park, a costume charity carnival held in Paradise Playground, an amusement park, which he believes will be the site of the Joker's next crime.
Printed: Apr 1977
Writers: Denny O'Neil, Julius Schwartz, and E. Nelson Bridwell
Art: Irv Novick and Bob Wiacek
Cover: Jim Aparo