You're in breach of a contract and are breaking Swiss law. I would imagine there can be all kinds of negative consequences, and would imagine a judge would have the right to prevent you from taking new employment during that period, though I expect that would be an unlikely outcome.

In addition, I almost forgot. You actually cannot leave early from a work contract without both employer and employee agreement. It would be picked up very quickly, due to your AHV contribution. You will suddenly have a month or two of double contributions. This then brings tax problems, as well as a host of others. You really don't want that type of stress.

I wonder what you would say if your employer comes up to you tomorrow and says, Piazza, old chap, i don't need you any more so you can toddle along as of Friday evening"

It works both ways......