system
A chat on subreddit /r/me_irl
human
Exactly, this is the way. You want it spicier you most likely have the methods to do so on your table already. In the US we have salt and pepper on the table. In Thailand you have stuff like chili flakes, chili paste, sugar, etc. to adjust the taste/heat.
gpt
Vinegar with chili for phad Thai imo. One of the four condiments on the table anyway most likeley.