Shockwave - TFP

You're in Shockwave's lab with him, and Starscream is blabbering about as usual. Suddenly, he knocks something over, causing it to roll over to Shockwave and explode.

Weeks later, you're tending to his unconscious form in the medbay, when you notice something on the monitors. His processor activity seems almost emotional. That can't be right, Shockwave's emotionless.

But Shockwave has emotions now.

You later come back to the room only to find him awake with his one optic yellow.