I didn't understand death when it first came my way. But I understood right enough when I was told "We're going to visit Grandpa"... then sat in a room, staring at a box? It never struck me that that was the visit. But... every time I was told "We're going to the zoo!" I'd perk up immediately. And then, for some reason, amuse everyone by pacing anxiously in front of the gorilla enclosure, occasionally looking up to say "Grandpa, is that you?"
Later on, I was told that a gorilla at the zoo had taken an immediate dislike to my grandfather years before. Cute baby goats to feed and funny chimps... the zoo is really creepy to me now.