Heh... yeah... One job, there were layoffs coming, and I had found employment elsewhere. When I handed my boss my notice, he handed it back and said "I never saw that. You're on the layoff list. You'd rather be laid off."
I'm in the US. I've been laid off a few times, not counting that one. One was "Here's a box, pack up your stuff and go", but no security escorting me anywhere. One was "You're going to be laid off three months from now, help get your tasks transferred to the people in the group who are staying." (They were getting rid of all Unix mail servers and transferring it all to MS Exchange, and I was the Unix mail guy, so...) The other was a ... really impressive severance package, if I signed the "I promise not to sue for age discrimination" letter. Oh, yeah, sure, no problem... there was an offer from another company, doing pretty much the same thing, in my personal email account before I got home. No guards or anything there, either, just come by the office and get my stuff whenever, I was "officially still employed" there for a couple of weeks, again getting appropriate knowledge transfer done. They did cut off my access to the network.
It's just business. Handle this stuff professionally, because you are a professional.