I consider myself a person who can handle A LOT of spice. However, I’m usually expecting it.
The other day I accidentally put a whole chile in my mouth (I was eating a noodle + veg dish called kwetiau so it hid wrapped in a thick vermicelli noodle) and I can still feel the spot in my mouth right where I bit down.
The red squiggle is a bit of sambal, a chile sauce eaten with everything on Java. It varies from a very smooth red paste all the way to a green with big chunks of chile pepper in it. Think of it as a home style Sriracha (you may call it rooster sauce) but with more pronounced sweet and sour components.