What normal everyday thing looks strange if done well

The only thing I can think of is typing. Maybe it doesn't look suspicious, but my siblings always give me weird looks when I do some typing, because I'm fairly quick at it, and never look at the keyboard while I type. I love seeing the look on their faces when we're having a conversation with each other and I'm looking at them while I type something completely unrelated.

 

Ya know I really do not look at the keyboard when I am typing at all (thanks to many years of schooling that forced me to type papers).
But to answer the question: I know a lot of history, specifically speaking the Revolutionary War, Civil War, both World Wars... Most major wars where America is involved. But if you really want me to shut up and listen start talking about planes like the P-51 Mustang or perhaps the P-47 Thunderbolt, or maybe the P-38 Lightning... OH, there is the story involving the P-38 Lighting where 6 of them were ordered to attack a plane carrying Admiral Yamamoto (The man who planned the attack on Pearl Harbor) and... wait... I think I answered the question.

Another thing that really would seem suspicious would be knowing a lot of chemistry... with chemistry you could create rockets or... I will stop there.

 

Someone being incredibly good at reading interpersonal communication is really unsettling as they can read what your thinking and feeling only by talking to you. They could know every though that your having just by looking at your face, or the inflection of your voice in the perfect way.

 

@SyWry Someone being good at interpersonal communication I don't think would be weird if and only if you two spend years training together and years more in combat conditions.

 

Hmm...I'd say stacking papers, folding clothes, fixing the bed, and handwriting, all example quite mundane and banal everyday things that are incredibly bizarre if done perfectly~

 

Marriage.

Cleaning looks rather odd if done well, at least to me...there's something very weird about a practically sterile house that doesn't look as though it's been lived in. I mean, you'd expect SOME clutter, or some personal touch that shows that an actual human being owns the house. When people tidy up - I mean really tidy up, not just move things from one place to another - it looks artificial and somewhat disturbing...