Ah, I have so many memories.

I was lab instructor at the local institute(it was more like tuition) where I had to train students for programming (C, C++, Core Java).
And my debugging skills got enhanced too, It was like I had to just look at the program and I could tell all the errors, it happens to everybody I think because our brain just find patterns un-consciously and it later becomes like one superpower.

No doubt there were a lot of bright students even brighter than me. Actually, that was my starting point where I broke out of my shell and started playing with coding a lot.