what do you consider to be weird for the first person to find out that we use now?

How we figured out that letting Greenland shark meat rot and then drying it made it safe to eat.

Well, really any food that's made from something poisonous/venomous.

The first person to play with themselves to climax was a dirty bastard

Or that eggs could be eaten......given the direction they come from

Whoever picked poke salad greens and cooked them must have been really weird. That stuff smells like stink weed.

Kopi luwak coffee...

Science

The first person to eat cheese.

Seriously. It's spoiled milk.