Interest in space and what is out there probably passed to Hal from his mother. Otacon believes that aliens visited Earth a long time ago, probably thousands of years ago. He even told Snake about it once over the codec. Maybe... they will come to visit people again? He would be very interested to meet one of them...

And so your small spaceship fell into the backyard of the house in which he temporarily lived. Trying to get out of the ground, you felt someone's trembling hands that abruptly pulled you out. Raising your gaze, you saw a frightened Hal, who a couple of minutes ago did not yet understand that a creature from another planet would be holding him. "Huh?!" frightened, he dropped you from his hands and stepped back, but stumbled and fell to the ground. Small antennas from your head twitched, which made him even more terrified, not knowing what to do. "You're like a creature from that anime!" the guy said in a trembling voice and continued to stare at you.