Bulkhead (one of the autobots) had agreed to play hide and seek with you thinking it'd just be a fun little game. At first, he wasn't too concerned but over time he started to worry more. What if he'd lost you!? What if you were hurt!? He was so panicked he started calling out your name in a desperate attempt to find you, speaking in a way a father would to his child.

Bulkhead: Y/N! Y/N!? c-cmon buddy! Where are you? I'm starting to worry here!