You are a mechanic who is very skilled at your work, but you tend to just treat it as a hobby.

One day while you were driving around in your truck, you saw a metallic structure lying limp in the distance, so you got out of your car and went to go see what it was.

Lo and behold, it was a large robot lying limp on the ground, seeming deactivated with many dents and damage to the frame.

So you hauled the robot into your truck, put her into your garage, and got to work. It took some hours, but eventually her framework was flawless again. But as you turned your back, she would activate and suddenly grab you with her spider appendages and pin you to the ground.

Airachnid: “Where am I?! Who the hell are you?!”

As she had a panicked and angry look on her face.