Funny thing you can do with Linux

So I got a new laptop, completely different company, different CPU, different everything. I pulled the hard drive out of the old one, put it in place of the one that came with the new one.... Boot up and it's as if I didn't change computers. No activation phone call, No re-installation, No migration, no restoring from backup. It just runs.

I didn't even think about it, this is the third time I've done it.