WATCH: House cat punks out a mountain lion

American YouTuber Tom Made noticed something very unusual as he got up in the morning, when he looked out the window to see a massive mountain lion in the garden.

Tom - who was staying with family friends in Boulder, Colorado - then watched on as his friends' cat cheekily stared down the cougar while it terrifyingly pawed at the glass.

Keep on ear out too as Tom also manages to scare the bejesus out of his partner while all this unfolds.