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$pinky = {};
$pinky->{zorch}{poit}{narf} = "I don't know, Brain, where will we get 
+hip-waders this time of night?";

$pinky = {};
# Ooh, you referenced zorch, and it's not there.
...
$pinky->{zorch}{poit}{narf} = undef;
# And you want to set that to a value:
$pinky->{zorch}{poit}{narf} = "I don't know, Brain, where will we get 
+hip-waders this time of night?";

$eat_memory={};
$eat_memory->{bad_idea}[99999][99999][99999] = "yummy, yummy, memory";