How much peanut butter is too much peanut butter?

Depends on what else you're eating. Peanut butter is a good source of protein and healthy fats, but very calorie dense so it's easy to put on weight when consuming it regularly. 

I heard that if you eat enough you can fly."Peanut butter gives you wings"

never enough tbh

If you don't have a weight problem, enjoy all you want of it! Peanut butter has 180 calories in 2 tablespoons. That is not very much of that delicious stuff!

When you start choking.

When you reach your daily calorie intake.