Thundercracker visits the Junkpile often, if only for something to do, to feel productive in between stints bouncing at the bar and his patrols as an enforcer on the police force.

He's gotten used to keeping very mindful of beings much smaller than he is. After all, one of his best friends charges is a living doll barely six inches in height who has a tendency to search the Junkpile as well. At some twenty feet tall, the Decepticon Seeker keeps his sensors and scanners at max sensitivity.

So when he picks up movement, he goes to investigate.