I worked at a place, where I was not laid off, but my friend was, on his birthday.
For me, this was a real eye-opener.
It would not have been a big deal for HR to wait another day, and then lay him off.
Another employee, also laid off, 2 days after moving out of his aunt's house and had put a deposit down on an apartment and DSL connection.
I think I left a month later right before the company imploded.