I think each family has a funhouse logic all its own, and in that distortion,in that delusion, all behavior can seem both perfectly normal and crazy.
Just driving I just was in a car on flat ground and I couldn't make it go. Having ticked driving and taken three driving lessons, I just was unable to produce any motion whatsoever under perfectly normal circumstances. I think we've all been busted on driving, and riding.
American men are more open, they are readier to express their emotions, but they also get frightened easily. Italians are used to drama. For us, arguing, shouting is perfectly normal - for them it is inconceivable.
New lesson, class. Most monsters will vaporize when sliced with a celestial bronze sword. This change is perfectly normal, and will happen to you right now if you don't BACK OFF!" - Percy
Five-foot-8 is a perfectly normal height for a woman - it's slightly but not at all unusually tall and certainly shouldn't be causing you any torment.
It's perfectly ordinary to be a socialist. It's perfectly normal to be in favor of fire departments.
Evolutionary theory informs our understanding of some frankly inexcusable social behavior and renders it perfectly normal.
I consider myself perfectly normal, and I don't know of any part of my life that would be so unusual as to interest the idly curious.
It was a perfectly normal gerbil. It appeared to be living in an exciting construction of cylinders, spheres and treadmills, such as the Spanish Inquisition would have devised if they'd had access to a plastics molding press.
If you have a crippling fear of public speaking, recognize that that is perfectly normal. And know that the only way to get over those nerves is to fully understand the material, the points, the policy you are trying to explain - and then practice it a little bit.