Resident Evil/Biohazard 2 parody, most likely. There was the fountain statue in RE2 where you had to place a medal to activate a certain switch. It's weird that they would parody Capcom, but it's not unheard of. Hell, Biggs and Wedge are named after Biggs Darklighter and Wedge Antilles from Star Wars, so a Biohazard parody shouldn't be surprising.