When people don't take off their shoes before entering.
this
F-in yes, so damn annoying.
Easy fix guys: either make sure to tell them when they come in, or just post a big sign. Since that's not a common practice, the onus is on you. When I was a teenager I used to make people take off their shoes before entering my room - had a sign for it. 
It's common practice here, it's considered rude if you don't. Unless you're like, helping someone move into a house or something when it doesn't make any sense. Whether it is a "common practice" or not is very dependent on location.
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I don't understand why anyone would want to keep their shoes on when they are at home. Doesn't it get really dirty, or don't people care since they still have their shoes on?
Now I'm just curious, when do you ever take off your shoes? You don't sleep with them on, right...?
I see this practice is USA, people walking around their houses in shoes, WTF?
The most shitty practice I have seen in houses. It's actually like they expect something bad to happen and are ready to run away asap.
haha, funny way to put it.
On another note, I thought that was how it was there, seeing that it's cold in northern countries and you would want to keep your feet warm as much possible.
That's what heaters are for? Those vent things that make your house warm? 
And socks. Wearing socks inside is fine. Shoes you wear outside.. if you were to wear them inside during the winter you would track snow EVERYWHERE. and that's a huge soggy mess to clean up.. Unless you have a pair of indoor shoes. I know of people who do that, but you definitely don't generally wear shoes you were just wearing out on the street indoors.
American Way of wearing shoes in the house:
-Son just came back to home, went off to the sofa, to watch tv, he keeps wearing the shoes on.
-Mom just came back from work, she changed to slippers because women do that if they are wearing some sexy heels.
-Mom just noticed some kind of mud on the carpet, she checks it.
-Mom finds out it's DOG SHIT which found it's way to the house on her own son's shoes.
-Mom wishes this never happened ? she should teach her kid to remove shoes when he comes back home. Enjoy your new carpet, or the smell of the old one, cuz this dried in and wants to stay.
