Scandinavia is cold, and i'm not only talking about weather. They like their personal space, unless you are a really close friend or a member of the family - and even then, touching is kept to a minimum. A hearty handshake in greeting is expected, but a kiss is not.
Say hi from far far far away ! (joking but keep a minimum distance) enjoy this picture http://countryballs.net/_nw/9/57325211.png
Not much tipping is required in Norway, as the service charge will always be included in your bill. It is common courtesy, however, leave more than 15% and you’re just showing off
To round up your bill to the next even 5 or 10 NOK amount, e.g. a 26,60 bill to 30 NOK. 10% is considered generous enough.
Every item has a fixed price tag, so unless the item is damaged trying to bargain over the price with a vendor will only get a puzzled look. Keep your haggling skills for a second-hand car salesman.
You can sure bargain on street markets i guess.
This is illegal in any country, but Norway enforces very strict laws for drunk drivers. A single beer can put you over the limit, which can result in a small fortune in fines, or prison.
If you drink, just walk home, Norway is not so big (each city i mean)
Norwegians often remove their shoes before entering a house, so wear clean socks. Only keep them on if the host suggests it.
No alternative known for now.