If a Colorado mountain lion casually strolled up in my backyard, I'd probably be freaking out. This man was not only able to keep his composure and film the rare encounter, but he even through in a joke about his kids being outside to tease his wife. The most peculiar part of the recording is how his house cat responds to coming face-to-face with the giant beast.  
Rather then be scared, the house cat seemed extremely curious at the sight of the big cat. Even when the mountain lion pawed at the window, the house cat kept his cool and didn't flinch. Eventually the wild animal walked away, but I can't believe how unfazed the domesticated pet was. I would have been freaking out!