Stop that Smiling
If you go around smiling at people and being overly friendly, the Swiss will think you have mental problems. I have had to train myself not to look directly at people and smile when I pass them. It's nothing personal, but people here keep to themselves and don't show much emotion in public. For a good example of this, visit a Swiss casino. The bells will be ringing and money will be pouring out of a slot machine, but you won't hear one human exclamation of victory.