I started a business in SF that brought me to Saigon, Hanoi and Da Nang (3 separate trips). I fell in love with the country and told everyone I'd move there someday. A year later, I quit. Immediately started searching for jobs in Saigon online and through contacts. Found a company through some mutual friends who hired me to come over and teach them about agile (I'm an ex-pivot). Got rid of everything I owned... Moved... haven't looked back.
Prior to my current consulting work, I randomly met a guy in a coffeshop in my apartment building who had a bitcoin book. I'm into crypto. Started talking, got invited to help install some litecoin asic machines for a new operation they were running just outside of Saigon. Became cto. Grew that to 1500 machines in two data centers (~5MW of power), ran that for 8 months until they pulled everything out of Vietnam (longer story).