OK, so it is through a sliding glass door, but you you have to admit, this house cat is pretty fearless for staring into the face of a giant mountain lion and not freaking the hell out.

YouTuber, Tom Mabe was visiting friends in Boulder, Colorado when he spotted the house cat vs wild cat action.

The inside kitty just most seems curious as the giant wild cat hisses and paws at the doors.

He calmly calls his wife into the room...

When she freaks and asks where the kids are, Mabe jokes, "They're out back!... just kidding they're still in bed."

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