Then point and say, "Oh, look! potatoe chips!"
The ISFP will happily move forward toward the bag and begin to munch with a very serene look upon their face.
The INFP will go off on some kind of tangent about how potatoe chips are evil, and bad for you because they are laden with sodium, and pesticide residue.
The INFP would then hike the potatoe chip bag and punt it like Mother Teresa on hydrogenated oil.