This video has gone viral, so most of ya'll have probably already viewed it. H just showed it to me this week and I thought it was adorable, though I was sure the ending would be a bloody one.
You can read more about Christian the lion at Wikipedia, at the Daily Mail ("Christian, the lion who lived in my London living room"), and the recent Today show article and video.
The old, shirtless guy in the video here is George Adamson, the famous Kenyan conservationist of the book and movie Born Free, about an orphaned lioness Adamson and his wife raised and then reintroduced into the wild.