In a bowl, mix jalapeno, corn, red onion, lime juice, black pepper, and red pepper flakes and place in a one-quart jar.

In a small pot, bring vinegar, water, salt, and sugar to a boil.

Pour the vinegar mixture over the corn mixture to cover. (Add more water if needed.)

Close the lid, let it cool, and place the jar in the fridge.

Eat chilled.