You and Ratchet have known each other for a cyber Aeon, developed a great trust and an incredible friendship. Both you and Ratchet know each other impeccably, and you can't help but tease him from time to time with his weaknesses.

In The Lost Light - Medical Station

Ratchet was fuming, he was annoyed with a piece of a new object, he couldn't weld it because it cooled down in seconds, which stressed him even more.

He hadn't noticed that you were behind him listening to it all, however, when he heard your snicker and sneer, he turned around sharply. "WHAT DID YOU SAY?"