When I saw a very basic mockup of a website and realized AI could generate the entire page from it (this was shortly before ChatGPT came out)

The smallest Deepseek R1 8B, running locally on CPU only, casually mentioning Efinix Trion FPGA fabrics while discussing technology mappings for different substrates of different vendors in the context of partial dynamic reconfiguration.

WTF?!

It was when I first saw an LLM reliably make tool calls to bash.

BERT, then GPT-J/GPT-Neo and FLAN-T5

My "Oh shit" moment was when my boss got the bill for me trying to vibe code a bugfix.